| Value | Category | Cases | |
|---|---|---|---|
| 1968 | 1 |
0%
|
|
| 1970 | 2 |
0%
|
|
| 1971 | 2 |
0%
|
|
| 1972 | 3 |
0.1%
|
|
| 1973 | 2 |
0%
|
|
| 1974 | 8 |
0.2%
|
|
| 1975 | 6 |
0.1%
|
|
| 1976 | 12 |
0.3%
|
|
| 1977 | 19 |
0.4%
|
|
| 1978 | 36 |
0.8%
|
|
| 1979 | 45 |
1%
|
|
| 1980 | 51 |
1.2%
|
|
| 1981 | 66 |
1.5%
|
|
| 1982 | 86 |
2%
|
|
| 1983 | 114 |
2.6%
|
|
| 1984 | 126 |
2.9%
|
|
| 1985 | 158 |
3.6%
|
|
| 1986 | 171 |
3.9%
|
|
| 1987 | 169 |
3.9%
|
|
| 1988 | 189 |
4.3%
|
|
| 1989 | 209 |
4.8%
|
|
| 1990 | 238 |
5.4%
|
|
| 1991 | 277 |
6.3%
|
|
| 1992 | 250 |
5.7%
|
|
| 1993 | 242 |
5.5%
|
|
| 1994 | 227 |
5.2%
|
|
| 1995 | 260 |
5.9%
|
|
| 1996 | 268 |
6.1%
|
|
| 1997 | 236 |
5.4%
|
|
| 1998 | 275 |
6.3%
|
|
| 1999 | 379 |
8.7%
|
|
| 2000 | 241 |
5.5%
|
|
| 9997 | Missing | 0 |
0%
|
| 9999 | Don't know | 3 |
0.1%
|
| Sysmiss | 2650 |