| Value | Category | Cases | |
|---|---|---|---|
| 1968 | 1 |
0%
|
|
| 1969 | 1 |
0%
|
|
| 1970 | 7 |
0.1%
|
|
| 1971 | 10 |
0.1%
|
|
| 1972 | 20 |
0.3%
|
|
| 1973 | 34 |
0.5%
|
|
| 1974 | 56 |
0.8%
|
|
| 1975 | 71 |
1%
|
|
| 1976 | 108 |
1.6%
|
|
| 1977 | 84 |
1.2%
|
|
| 1978 | 94 |
1.4%
|
|
| 1979 | 136 |
2%
|
|
| 1980 | 129 |
1.9%
|
|
| 1981 | 199 |
2.9%
|
|
| 1982 | 233 |
3.4%
|
|
| 1983 | 299 |
4.4%
|
|
| 1984 | 324 |
4.7%
|
|
| 1985 | 361 |
5.3%
|
|
| 1986 | 390 |
5.7%
|
|
| 1987 | 377 |
5.5%
|
|
| 1988 | 299 |
4.4%
|
|
| 1989 | 282 |
4.1%
|
|
| 1990 | 334 |
4.9%
|
|
| 1991 | 283 |
4.1%
|
|
| 1992 | 338 |
4.9%
|
|
| 1993 | 362 |
5.3%
|
|
| 1994 | 430 |
6.3%
|
|
| 1995 | 268 |
3.9%
|
|
| 1996 | 323 |
4.7%
|
|
| 1997 | 310 |
4.5%
|
|
| 1998 | 281 |
4.1%
|
|
| 1999 | 299 |
4.4%
|
|
| 2000 | 118 |
1.7%
|
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | dk | 1 |
0%
|
| Sysmiss | 8489 |