| Value | Category | Cases | |
|---|---|---|---|
| 1995 | 104 |
3.4%
|
|
| 1996 | 401 |
13.1%
|
|
| 1997 | 428 |
14%
|
|
| 1998 | 513 |
16.8%
|
|
| 1999 | 873 |
28.6%
|
|
| 2000 | 729 |
23.9%
|
|
| 9997 | Inconsistent | 5 |
0.2%
|
| 9998 | DK | 2 |
0.1%
|
| Sysmiss | 24547 |