| Value | Category | Cases | |
|---|---|---|---|
| 1996 | 31 |
9.3%
|
|
| 1997 | 119 |
35.7%
|
|
| 1998 | 95 |
28.5%
|
|
| 1999 | 62 |
18.6%
|
|
| 2000 | 25 |
7.5%
|
|
| 9997 | inconsistent | 1 |
0.3%
|
| 9998 | dk | 0 |
0%
|
| Sysmiss | 6422 |