| Value | Category | Cases | |
|---|---|---|---|
| 1995 | 53 |
1.5%
|
|
| 1996 | 484 |
13.9%
|
|
| 1997 | 505 |
14.5%
|
|
| 1998 | 612 |
17.6%
|
|
| 1999 | 947 |
27.2%
|
|
| 2000 | 875 |
25.1%
|
|
| 9997 | Inconsistent | 7 |
0.2%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 24119 |