| Value | Category | Cases | |
|---|---|---|---|
| 1992 | 43 |
5.9%
|
|
| 1993 | 80 |
10.9%
|
|
| 1994 | 96 |
13.1%
|
|
| 1995 | 123 |
16.8%
|
|
| 1996 | 179 |
24.4%
|
|
| 1997 | 212 |
28.9%
|
|
| 1998 | 1 |
0.1%
|
|
| Sysmiss | 9622 |