| Value | Category | Cases | |
|---|---|---|---|
| 1995 | 76 |
5.5%
|
|
| 1996 | 278 |
20.2%
|
|
| 1997 | 303 |
22%
|
|
| 1998 | 270 |
19.6%
|
|
| 1999 | 268 |
19.5%
|
|
| 2000 | 180 |
13.1%
|
|
| 9997 | Missing | 0 |
0%
|
| Sysmiss | 1246 |