| Value | Category | Cases | |
|---|---|---|---|
| 1995 | 179 |
6.6%
|
|
| 1996 | 498 |
18.4%
|
|
| 1997 | 535 |
19.8%
|
|
| 1998 | 496 |
18.3%
|
|
| 1999 | 598 |
22.1%
|
|
| 2000 | 169 |
6.3%
|
|
| 9997 | Missing | 49 |
1.8%
|
| 9999 | DK | 180 |
6.7%
|