| Value | Category | Cases | |
|---|---|---|---|
| 1978 | 1 |
0.1%
|
|
| 1979 | 2 |
0.2%
|
|
| 1981 | 2 |
0.2%
|
|
| 1982 | 6 |
0.5%
|
|
| 1983 | 8 |
0.7%
|
|
| 1984 | 13 |
1.2%
|
|
| 1985 | 17 |
1.6%
|
|
| 1986 | 33 |
3%
|
|
| 1987 | 38 |
3.5%
|
|
| 1988 | 42 |
3.8%
|
|
| 1989 | 69 |
6.3%
|
|
| 1990 | 71 |
6.5%
|
|
| 1991 | 72 |
6.6%
|
|
| 1992 | 84 |
7.7%
|
|
| 1993 | 91 |
8.3%
|
|
| 1994 | 117 |
10.7%
|
|
| 1995 | 85 |
7.8%
|
|
| 1996 | 96 |
8.8%
|
|
| 1997 | 84 |
7.7%
|
|
| 1998 | 77 |
7%
|
|
| 1999 | 64 |
5.8%
|
|
| 2000 | 24 |
2.2%
|
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | dk | 0 |
0%
|
| Sysmiss | 14889 |