| Value | Category | Cases | |
|---|---|---|---|
| 1995 | 55 |
1.6%
|
|
| 1996 | 482 |
14%
|
|
| 1997 | 500 |
14.5%
|
|
| 1998 | 606 |
17.5%
|
|
| 1999 | 936 |
27.1%
|
|
| 2000 | 866 |
25.1%
|
|
| 9997 | Inconsistent | 8 |
0.2%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 24149 |