| Value | Category | Cases | |
|---|---|---|---|
| 1967 | 1 |
0%
|
|
| 1968 | 1 |
0%
|
|
| 1970 | 3 |
0.1%
|
|
| 1971 | 2 |
0%
|
|
| 1972 | 4 |
0.1%
|
|
| 1973 | 24 |
0.4%
|
|
| 1974 | 33 |
0.6%
|
|
| 1975 | 50 |
0.8%
|
|
| 1976 | 58 |
1%
|
|
| 1977 | 65 |
1.1%
|
|
| 1978 | 92 |
1.5%
|
|
| 1979 | 120 |
2%
|
|
| 1980 | 131 |
2.2%
|
|
| 1981 | 170 |
2.9%
|
|
| 1982 | 170 |
2.9%
|
|
| 1983 | 179 |
3%
|
|
| 1984 | 193 |
3.2%
|
|
| 1985 | 207 |
3.5%
|
|
| 1986 | 196 |
3.3%
|
|
| 1987 | 208 |
3.5%
|
|
| 1988 | 189 |
3.2%
|
|
| 1989 | 183 |
3.1%
|
|
| 1990 | 240 |
4%
|
|
| 1991 | 250 |
4.2%
|
|
| 1992 | 188 |
3.2%
|
|
| 1993 | 222 |
3.7%
|
|
| 1994 | 282 |
4.7%
|
|
| 1995 | 392 |
6.6%
|
|
| 1996 | 419 |
7%
|
|
| 1997 | 483 |
8.1%
|
|
| 1998 | 444 |
7.5%
|
|
| 1999 | 455 |
7.6%
|
|
| 2000 | 302 |
5.1%
|
|
| 9997 | Missing | 0 |
0%
|
| 9999 | DK | 2 |
0%
|
| Sysmiss | 2768 |