| Value | Category | Cases | |
|---|---|---|---|
| 1966 | 10 |
0%
|
|
| 1967 | 300 |
0.9%
|
|
| 1968 | 501 |
1.5%
|
|
| 1969 | 374 |
1.1%
|
|
| 1970 | 485 |
1.4%
|
|
| 1971 | 909 |
2.6%
|
|
| 1972 | 429 |
1.2%
|
|
| 1973 | 447 |
1.3%
|
|
| 1974 | 599 |
1.7%
|
|
| 1975 | 534 |
1.6%
|
|
| 1976 | 1523 |
4.4%
|
|
| 1977 | 476 |
1.4%
|
|
| 1978 | 756 |
2.2%
|
|
| 1979 | 613 |
1.8%
|
|
| 1980 | 881 |
2.6%
|
|
| 1981 | 1521 |
4.4%
|
|
| 1982 | 798 |
2.3%
|
|
| 1983 | 695 |
2%
|
|
| 1984 | 920 |
2.7%
|
|
| 1985 | 740 |
2.2%
|
|
| 1986 | 2079 |
6%
|
|
| 1987 | 711 |
2.1%
|
|
| 1988 | 1101 |
3.2%
|
|
| 1989 | 933 |
2.7%
|
|
| 1990 | 999 |
2.9%
|
|
| 1991 | 2086 |
6.1%
|
|
| 1992 | 946 |
2.8%
|
|
| 1993 | 911 |
2.7%
|
|
| 1994 | 1068 |
3.1%
|
|
| 1995 | 872 |
2.5%
|
|
| 1996 | 1839 |
5.3%
|
|
| 1997 | 965 |
2.8%
|
|
| 1998 | 1464 |
4.3%
|
|
| 1999 | 1263 |
3.7%
|
|
| 2000 | 1505 |
4.4%
|
|
| 2001 | 1445 |
4.2%
|
|
| 2002 | 8 |
0%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 597 |
1.7%
|
| 9999 | Missing | 73 |
0.2%
|
| Sysmiss | 1800 |