| Value | Category | Cases | |
|---|---|---|---|
| 1993 | 4 |
0.1%
|
|
| 1994 | 444 |
13.7%
|
|
| 1995 | 765 |
23.7%
|
|
| 1996 | 731 |
22.6%
|
|
| 1997 | 526 |
16.3%
|
|
| 1998 | 330 |
10.2%
|
|
| 1999 | 325 |
10.1%
|
|
| 2000 | 107 |
3.3%
|
|
| Sysmiss | 9004 |