| Value | Category | Cases | |
|---|---|---|---|
| 1975 | 1 |
0.1%
|
|
| 1976 | 1 |
0.1%
|
|
| 1978 | 2 |
0.1%
|
|
| 1980 | 5 |
0.3%
|
|
| 1981 | 11 |
0.6%
|
|
| 1982 | 21 |
1.2%
|
|
| 1983 | 18 |
1%
|
|
| 1984 | 35 |
2%
|
|
| 1985 | 45 |
2.5%
|
|
| 1986 | 62 |
3.5%
|
|
| 1987 | 80 |
4.5%
|
|
| 1988 | 109 |
6.1%
|
|
| 1989 | 94 |
5.3%
|
|
| 1990 | 104 |
5.9%
|
|
| 1991 | 132 |
7.4%
|
|
| 1992 | 141 |
7.9%
|
|
| 1993 | 170 |
9.6%
|
|
| 1994 | 192 |
10.8%
|
|
| 1995 | 99 |
5.6%
|
|
| 1996 | 116 |
6.5%
|
|
| 1997 | 124 |
7%
|
|
| 1998 | 80 |
4.5%
|
|
| 1999 | 93 |
5.2%
|
|
| 2000 | 41 |
2.3%
|
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | dk | 1 |
0.1%
|
| Sysmiss | 13574 |