| Value | Category | Cases | |
|---|---|---|---|
| 1996 | 272 |
16.1%
|
|
| 1997 | 412 |
24.4%
|
|
| 1998 | 401 |
23.7%
|
|
| 1999 | 403 |
23.9%
|
|
| 2000 | 201 |
11.9%
|
|
| 9997 | Missing | 0 |
0%
|
| Sysmiss | 932 |