| Value | Category | Cases | |
|---|---|---|---|
| 1977 | 3 |
0%
|
|
| 1978 | 4 |
0%
|
|
| 1979 | 6 |
0%
|
|
| 1980 | 47 |
0.2%
|
|
| 1981 | 45 |
0.2%
|
|
| 1982 | 72 |
0.3%
|
|
| 1983 | 69 |
0.3%
|
|
| 1984 | 142 |
0.6%
|
|
| 1985 | 193 |
0.8%
|
|
| 1986 | 249 |
1%
|
|
| 1987 | 201 |
0.8%
|
|
| 1988 | 266 |
1%
|
|
| 1989 | 294 |
1.2%
|
|
| 1990 | 535 |
2.1%
|
|
| 1991 | 416 |
1.6%
|
|
| 1992 | 354 |
1.4%
|
|
| 1993 | 412 |
1.6%
|
|
| 1994 | 485 |
1.9%
|
|
| 1995 | 621 |
2.4%
|
|
| 1996 | 691 |
2.7%
|
|
| 1997 | 545 |
2.1%
|
|
| 1998 | 666 |
2.6%
|
|
| 1999 | 800 |
3.1%
|
|
| 2000 | 1185 |
4.7%
|
|
| 2001 | 859 |
3.4%
|
|
| 2002 | 736 |
2.9%
|
|
| 2003 | 747 |
2.9%
|
|
| 2004 | 774 |
3%
|
|
| 2005 | 819 |
3.2%
|
|
| 2006 | 929 |
3.7%
|
|
| 2007 | 835 |
3.3%
|
|
| 2008 | 937 |
3.7%
|
|
| 2009 | 960 |
3.8%
|
|
| 2010 | 1063 |
4.2%
|
|
| 2011 | 1037 |
4.1%
|
|
| 2012 | 990 |
3.9%
|
|
| 2013 | 958 |
3.8%
|
|
| 2014 | 1012 |
4%
|
|
| 2015 | 820 |
3.2%
|
|
| 2016 | 467 |
1.8%
|
|
| 2017 | 3 |
0%
|
|
| 9997 | Inconsistent | 159 |
0.6%
|
| 9998 | DK | 2325 |
9.1%
|
| 9999 | Missing | 707 |
2.8%
|
| Sysmiss | 10738 |