| Value | Category | Cases | |
|---|---|---|---|
| 1972 | 2 |
0.1%
|
|
| 1973 | 2 |
0.1%
|
|
| 1974 | 1 |
0%
|
|
| 1975 | 6 |
0.2%
|
|
| 1976 | 10 |
0.3%
|
|
| 1977 | 11 |
0.3%
|
|
| 1978 | 21 |
0.5%
|
|
| 1979 | 33 |
0.9%
|
|
| 1980 | 58 |
1.5%
|
|
| 1981 | 76 |
2%
|
|
| 1982 | 107 |
2.8%
|
|
| 1983 | 134 |
3.5%
|
|
| 1984 | 127 |
3.3%
|
|
| 1985 | 122 |
3.2%
|
|
| 1986 | 161 |
4.2%
|
|
| 1987 | 206 |
5.3%
|
|
| 1988 | 233 |
6%
|
|
| 1989 | 275 |
7.1%
|
|
| 1990 | 275 |
7.1%
|
|
| 1991 | 263 |
6.8%
|
|
| 1992 | 256 |
6.6%
|
|
| 1993 | 254 |
6.6%
|
|
| 1994 | 293 |
7.6%
|
|
| 1995 | 171 |
4.4%
|
|
| 1996 | 193 |
5%
|
|
| 1997 | 170 |
4.4%
|
|
| 1998 | 164 |
4.2%
|
|
| 1999 | 173 |
4.5%
|
|
| 2000 | 62 |
1.6%
|
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | dk | 1 |
0%
|
| Sysmiss | 12125 |