| Value | Category | Cases | |
|---|---|---|---|
| 1966 | 1 |
0%
|
|
| 1967 | 1 |
0%
|
|
| 1968 | 5 |
0.1%
|
|
| 1969 | 12 |
0.3%
|
|
| 1970 | 20 |
0.5%
|
|
| 1971 | 34 |
0.8%
|
|
| 1972 | 38 |
0.9%
|
|
| 1973 | 38 |
0.9%
|
|
| 1974 | 72 |
1.6%
|
|
| 1975 | 86 |
2%
|
|
| 1976 | 81 |
1.9%
|
|
| 1977 | 91 |
2.1%
|
|
| 1978 | 131 |
3%
|
|
| 1979 | 109 |
2.5%
|
|
| 1980 | 151 |
3.5%
|
|
| 1981 | 177 |
4%
|
|
| 1982 | 187 |
4.3%
|
|
| 1983 | 166 |
3.8%
|
|
| 1984 | 170 |
3.9%
|
|
| 1985 | 198 |
4.5%
|
|
| 1986 | 192 |
4.4%
|
|
| 1987 | 187 |
4.3%
|
|
| 1988 | 230 |
5.3%
|
|
| 1989 | 201 |
4.6%
|
|
| 1990 | 210 |
4.8%
|
|
| 1991 | 217 |
5%
|
|
| 1992 | 184 |
4.2%
|
|
| 1993 | 186 |
4.3%
|
|
| 1994 | 171 |
3.9%
|
|
| 1995 | 149 |
3.4%
|
|
| 1996 | 136 |
3.1%
|
|
| 1997 | 131 |
3%
|
|
| 1998 | 128 |
2.9%
|
|
| 1999 | 135 |
3.1%
|
|
| 2000 | 91 |
2.1%
|
|
| 9997 | Missing | 0 |
0%
|
| 9999 | Don't know | 55 |
1.3%
|
| Sysmiss | 2650 |