| Value | Category | Cases | |
|---|---|---|---|
| 1995 | 6 |
0.3%
|
|
| 1996 | 257 |
12.3%
|
|
| 1997 | 299 |
14.3%
|
|
| 1998 | 391 |
18.7%
|
|
| 1999 | 572 |
27.4%
|
|
| 2000 | 560 |
26.8%
|
|
| 9997 | inconsistent | 1 |
0%
|
| 9998 | dk | 0 |
0%
|
| Sysmiss | 1903 |