| Value | Category | Cases | |
|---|---|---|---|
| 1995 | 29 |
1.6%
|
|
| 1996 | 379 |
20.3%
|
|
| 1997 | 453 |
24.3%
|
|
| 1998 | 388 |
20.8%
|
|
| 1999 | 391 |
21%
|
|
| 2000 | 223 |
12%
|
|
| 9997 | Missing | 0 |
0%
|
| Sysmiss | 758 |