| Value | Category | Cases | |
|---|---|---|---|
| 1991 | 16 |
2.5%
|
|
| 1992 | 38 |
5.9%
|
|
| 1993 | 36 |
5.6%
|
|
| 1994 | 41 |
6.4%
|
|
| 1995 | 50 |
7.8%
|
|
| 1996 | 34 |
5.3%
|
|
| 1997 | 27 |
4.2%
|
|
| 1998 | 44 |
6.8%
|
|
| 1999 | 61 |
9.5%
|
|
| 2000 | 67 |
10.4%
|
|
| 2001 | 60 |
9.3%
|
|
| 2002 | 62 |
9.6%
|
|
| 2003 | 79 |
12.3%
|
|
| 2004 | 28 |
4.4%
|
|
| Sysmiss | 910 |