| Value | Category | Cases | |
|---|---|---|---|
| 1991 | 21 |
3.5%
|
|
| 1992 | 33 |
5.4%
|
|
| 1993 | 37 |
6.1%
|
|
| 1994 | 37 |
6.1%
|
|
| 1995 | 44 |
7.3%
|
|
| 1996 | 25 |
4.1%
|
|
| 1997 | 27 |
4.5%
|
|
| 1998 | 43 |
7.1%
|
|
| 1999 | 60 |
9.9%
|
|
| 2000 | 61 |
10.1%
|
|
| 2001 | 56 |
9.2%
|
|
| 2002 | 62 |
10.2%
|
|
| 2003 | 71 |
11.7%
|
|
| 2004 | 29 |
4.8%
|
|
| Sysmiss | 947 |