| Value | Category | Cases | |
|---|---|---|---|
| 1991 | 1 |
0.3%
|
|
| 1993 | 2 |
0.6%
|
|
| 1994 | 6 |
1.9%
|
|
| 1995 | 1 |
0.3%
|
|
| 1996 | 2 |
0.6%
|
|
| 1997 | 3 |
0.9%
|
|
| 1998 | 9 |
2.8%
|
|
| 1999 | 5 |
1.5%
|
|
| 2000 | 18 |
5.6%
|
|
| 2001 | 8 |
2.5%
|
|
| 2002 | 6 |
1.9%
|
|
| 2003 | 14 |
4.3%
|
|
| 2004 | 17 |
5.3%
|
|
| 2005 | 32 |
9.9%
|
|
| 2006 | 43 |
13.3%
|
|
| 2007 | 74 |
22.9%
|
|
| 2008 | 82 |
25.4%
|
|
| Sysmiss | 2509 |