| value | category | cases | |
|---|---|---|---|
| 1969 | 5 |
0.1%
|
|
| 1973 | 19 |
0.5%
|
|
| 1974 | 18 |
0.5%
|
|
| 1975 | 37 |
1%
|
|
| 1976 | 4 |
0.1%
|
|
| 1977 | 50 |
1.3%
|
|
| 1978 | 29 |
0.8%
|
|
| 1979 | 65 |
1.7%
|
|
| 1980 | 68 |
1.8%
|
|
| 1981 | 50 |
1.3%
|
|
| 1982 | 75 |
2%
|
|
| 1983 | 89 |
2.4%
|
|
| 1984 | 148 |
4%
|
|
| 1985 | 157 |
4.2%
|
|
| 1986 | 128 |
3.4%
|
|
| 1987 | 138 |
3.7%
|
|
| 1988 | 241 |
6.4%
|
|
| 1989 | 180 |
4.8%
|
|
| 1990 | 197 |
5.3%
|
|
| 1991 | 223 |
6%
|
|
| 1992 | 197 |
5.3%
|
|
| 1993 | 300 |
8%
|
|
| 1994 | 272 |
7.3%
|
|
| 1995 | 321 |
8.6%
|
|
| 1996 | 391 |
10.4%
|
|
| 1997 | 340 |
9.1%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | Don't know | 0 |
0%
|
| Sysmiss | 37778 |