| Value | Category | Cases | |
|---|---|---|---|
| 1995 | 8 |
5.7%
|
|
| 1996 | 4 |
2.8%
|
|
| 1997 | 13 |
9.2%
|
|
| 1998 | 33 |
23.4%
|
|
| 1999 | 36 |
25.5%
|
|
| 2000 | 11 |
7.8%
|
|
| 2001 | 20 |
14.2%
|
|
| 2002 | 16 |
11.3%
|
|
| Sysmiss | 655 |