| Value | Category | Cases | |
|---|---|---|---|
| 1984 | 2 |
7.4%
|
|
| 1985 | 4 |
14.8%
|
|
| 1986 | 3 |
11.1%
|
|
| 1987 | 2 |
7.4%
|
|
| 1988 | 2 |
7.4%
|
|
| 1989 | 7 |
25.9%
|
|
| 1990 | 1 |
3.7%
|
|
| 1991 | 1 |
3.7%
|
|
| 1992 | 2 |
7.4%
|
|
| 1993 | 1 |
3.7%
|
|
| 1994 | 2 |
7.4%
|
|
| Sysmiss | 4 |