| Value | Category | Cases | |
|---|---|---|---|
| 1996 | 103 |
29.2%
|
|
| 1997 | 117 |
33.1%
|
|
| 1998 | 92 |
26.1%
|
|
| 1999 | 26 |
7.4%
|
|
| 2000 | 14 |
4%
|
|
| 9997 | inconsistent | 1 |
0.3%
|
| 9998 | dk | 0 |
0%
|
| Sysmiss | 6402 |