| Value | Category | Cases | |
|---|---|---|---|
| 1985 | 1 |
1%
|
|
| 1987 | 1 |
1%
|
|
| 1988 | 2 |
2%
|
|
| 1989 | 5 |
4.9%
|
|
| 1990 | 6 |
5.9%
|
|
| 1991 | 5 |
4.9%
|
|
| 1992 | 7 |
6.9%
|
|
| 1993 | 11 |
10.8%
|
|
| 1994 | 13 |
12.7%
|
|
| 1995 | 8 |
7.8%
|
|
| 1996 | 8 |
7.8%
|
|
| 1997 | 8 |
7.8%
|
|
| 1998 | 10 |
9.8%
|
|
| 1999 | 8 |
7.8%
|
|
| 2000 | 9 |
8.8%
|
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | dk | 0 |
0%
|
| Sysmiss | 15883 |