| Value | Category | Cases | |
|---|---|---|---|
| 1996 | 99 |
6.2%
|
|
| 1997 | 168 |
10.6%
|
|
| 1998 | 287 |
18.1%
|
|
| 1999 | 507 |
31.9%
|
|
| 2000 | 528 |
33.2%
|
|
| 9997 | inconsistent | 1 |
0.1%
|
| 9998 | dk | 0 |
0%
|
| Sysmiss | 5165 |