| Value | Category | Cases | |
|---|---|---|---|
| 1996 | 10 |
35.7%
|
|
| 1997 | 15 |
53.6%
|
|
| 1998 | 1 |
3.6%
|
|
| 2000 | 2 |
7.1%
|
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | dk | 0 |
0%
|
| Sysmiss | 6727 |