| Value | Category | Cases | |
|---|---|---|---|
| -99 | -99. DON'T KNOW | 288 | 
                                                                 
                                    
                                    26.5%
                                 
                                                             | 
                                                        
                    
| 1950 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 1952 | 3 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 1955 | 2 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 1956 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 1958 | 7 | 
                                                                 
                                    
                                    0.6%
                                 
                                                             | 
                                                        
                    |
| 1960 | 7 | 
                                                                 
                                    
                                    0.6%
                                 
                                                             | 
                                                        
                    |
| 1962 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 1965 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 1966 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 1968 | 2 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 1970 | 5 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 1972 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 1973 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 1974 | 3 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 1975 | 6 | 
                                                                 
                                    
                                    0.6%
                                 
                                                             | 
                                                        
                    |
| 1976 | 12 | 
                                                                 
                                    
                                    1.1%
                                 
                                                             | 
                                                        
                    |
| 1977 | 7 | 
                                                                 
                                    
                                    0.6%
                                 
                                                             | 
                                                        
                    |
| 1978 | 15 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                                                        
                    |
| 1979 | 3 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 1980 | 22 | 
                                                                 
                                    
                                    2%
                                 
                                                             | 
                                                        
                    |
| 1981 | 3 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 1982 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 1983 | 4 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 1984 | 3 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 1985 | 7 | 
                                                                 
                                    
                                    0.6%
                                 
                                                             | 
                                                        
                    |
| 1986 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 1987 | 7 | 
                                                                 
                                    
                                    0.6%
                                 
                                                             | 
                                                        
                    |
| 1988 | 30 | 
                                                                 
                                    
                                    2.8%
                                 
                                                             | 
                                                        
                    |
| 1989 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 1990 | 6 | 
                                                                 
                                    
                                    0.6%
                                 
                                                             | 
                                                        
                    |
| 1991 | 3 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 1992 | 6 | 
                                                                 
                                    
                                    0.6%
                                 
                                                             | 
                                                        
                    |
| 1993 | 14 | 
                                                                 
                                    
                                    1.3%
                                 
                                                             | 
                                                        
                    |
| 1994 | 4 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 1995 | 8 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 1996 | 3 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 1997 | 2 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 1998 | 33 | 
                                                                 
                                    
                                    3%
                                 
                                                             | 
                                                        
                    |
| 1999 | 8 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 2000 | 18 | 
                                                                 
                                    
                                    1.7%
                                 
                                                             | 
                                                        
                    |
| 2001 | 9 | 
                                                                 
                                    
                                    0.8%
                                 
                                                             | 
                                                        
                    |
| 2002 | 8 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 2003 | 13 | 
                                                                 
                                    
                                    1.2%
                                 
                                                             | 
                                                        
                    |
| 2004 | 10 | 
                                                                 
                                    
                                    0.9%
                                 
                                                             | 
                                                        
                    |
| 2005 | 12 | 
                                                                 
                                    
                                    1.1%
                                 
                                                             | 
                                                        
                    |
| 2006 | 8 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 2007 | 15 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                                                        
                    |
| 2008 | 26 | 
                                                                 
                                    
                                    2.4%
                                 
                                                             | 
                                                        
                    |
| 2009 | 10 | 
                                                                 
                                    
                                    0.9%
                                 
                                                             | 
                                                        
                    |
| 2010 | 27 | 
                                                                 
                                    
                                    2.5%
                                 
                                                             | 
                                                        
                    |
| 2011 | 23 | 
                                                                 
                                    
                                    2.1%
                                 
                                                             | 
                                                        
                    |
| 2012 | 16 | 
                                                                 
                                    
                                    1.5%
                                 
                                                             | 
                                                        
                    |
| 2013 | 28 | 
                                                                 
                                    
                                    2.6%
                                 
                                                             | 
                                                        
                    |
| 2014 | 36 | 
                                                                 
                                    
                                    3.3%
                                 
                                                             | 
                                                        
                    |
| 2015 | 51 | 
                                                                 
                                    
                                    4.7%
                                 
                                                             | 
                                                        
                    |
| 2016 | 77 | 
                                                                 
                                    
                                    7.1%
                                 
                                                             | 
                                                        
                    |
| 2017 | 96 | 
                                                                 
                                    
                                    8.8%
                                 
                                                             | 
                                                        
                    |
| 2018 | 72 | 
                                                                 
                                    
                                    6.6%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 14275 |