| Value | Category | Cases | |
|---|---|---|---|
| 1995 | 1 |
0.3%
|
|
| 1996 | 122 |
33.4%
|
|
| 1997 | 121 |
33.2%
|
|
| 1998 | 86 |
23.6%
|
|
| 1999 | 24 |
6.6%
|
|
| 2000 | 11 |
3%
|
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | dk | 0 |
0%
|
| Sysmiss | 6390 |