| Value | Category | Cases | |
|---|---|---|---|
| 1991 | 20 |
2.9%
|
|
| 1992 | 37 |
5.4%
|
|
| 1993 | 41 |
6%
|
|
| 1994 | 40 |
5.8%
|
|
| 1995 | 60 |
8.8%
|
|
| 1996 | 25 |
3.6%
|
|
| 1997 | 30 |
4.4%
|
|
| 1998 | 46 |
6.7%
|
|
| 1999 | 66 |
9.6%
|
|
| 2000 | 62 |
9.1%
|
|
| 2001 | 74 |
10.8%
|
|
| 2002 | 68 |
9.9%
|
|
| 2003 | 84 |
12.3%
|
|
| 2004 | 32 |
4.7%
|
|
| Sysmiss | 868 |