| Value | Category | Cases | |
|---|---|---|---|
| 1974 | 2 |
0.1%
|
|
| 1976 | 2 |
0.1%
|
|
| 1977 | 2 |
0.1%
|
|
| 1978 | 7 |
0.3%
|
|
| 1979 | 12 |
0.4%
|
|
| 1980 | 21 |
0.8%
|
|
| 1981 | 30 |
1.1%
|
|
| 1982 | 48 |
1.8%
|
|
| 1983 | 59 |
2.2%
|
|
| 1984 | 81 |
3%
|
|
| 1985 | 99 |
3.6%
|
|
| 1986 | 116 |
4.3%
|
|
| 1987 | 106 |
3.9%
|
|
| 1988 | 142 |
5.2%
|
|
| 1989 | 159 |
5.8%
|
|
| 1990 | 199 |
7.3%
|
|
| 1991 | 192 |
7.1%
|
|
| 1992 | 225 |
8.3%
|
|
| 1993 | 219 |
8%
|
|
| 1994 | 235 |
8.6%
|
|
| 1995 | 159 |
5.8%
|
|
| 1996 | 153 |
5.6%
|
|
| 1997 | 143 |
5.3%
|
|
| 1998 | 118 |
4.3%
|
|
| 1999 | 140 |
5.1%
|
|
| 2000 | 52 |
1.9%
|
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | dk | 0 |
0%
|
| Sysmiss | 13264 |