| Value | Category | Cases | |
|---|---|---|---|
| 1995 | 2 |
0.4%
|
|
| 1996 | 4 |
0.9%
|
|
| 1997 | 5 |
1.1%
|
|
| 1998 | 3 |
0.6%
|
|
| 1999 | 16 |
3.4%
|
|
| 2000 | 17 |
3.6%
|
|
| 2001 | 31 |
6.6%
|
|
| 2002 | 37 |
7.9%
|
|
| 2003 | 67 |
14.3%
|
|
| 2004 | 84 |
17.9%
|
|
| 2005 | 123 |
26.3%
|
|
| 2006 | 77 |
16.5%
|
|
| 2007 | 2 |
0.4%
|
|
| Sysmiss | 454 |