| Value | Category | Cases | |
|---|---|---|---|
| 1990 | 151 |
30.5%
|
|
| 1991 | 52 |
10.5%
|
|
| 1992 | 67 |
13.5%
|
|
| 1993 | 64 |
12.9%
|
|
| 1994 | 77 |
15.6%
|
|
| 1995 | 38 |
7.7%
|
|
| 1996 | 29 |
5.9%
|
|
| 1997 | 17 |
3.4%
|
|
| Sysmiss | 426 |