| Value | Category | Cases | |
|---|---|---|---|
| 1995 | 22 |
1.1%
|
|
| 1996 | 259 |
12.4%
|
|
| 1997 | 281 |
13.5%
|
|
| 1998 | 364 |
17.5%
|
|
| 1999 | 564 |
27.1%
|
|
| 2000 | 591 |
28.4%
|
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | dk | 0 |
0%
|
| Sysmiss | 1908 |