| Value | Category | Cases | |
|---|---|---|---|
| 1995 | 1 |
0.4%
|
|
| 1996 | 1 |
0.4%
|
|
| 1998 | 2 |
0.8%
|
|
| 1999 | 8 |
3.3%
|
|
| 2000 | 10 |
4.1%
|
|
| 2001 | 6 |
2.5%
|
|
| 2002 | 26 |
10.7%
|
|
| 2003 | 33 |
13.6%
|
|
| 2004 | 42 |
17.3%
|
|
| 2005 | 61 |
25.1%
|
|
| 2006 | 50 |
20.6%
|
|
| 2007 | 3 |
1.2%
|
|
| Sysmiss | 679 |