| Value | Category | Cases | |
|---|---|---|---|
| 1995 | 1 |
0.2%
|
|
| 1996 | 4 |
0.9%
|
|
| 1997 | 4 |
0.9%
|
|
| 1998 | 2 |
0.5%
|
|
| 1999 | 15 |
3.4%
|
|
| 2000 | 17 |
3.9%
|
|
| 2001 | 28 |
6.4%
|
|
| 2002 | 34 |
7.8%
|
|
| 2003 | 63 |
14.4%
|
|
| 2004 | 80 |
18.3%
|
|
| 2005 | 115 |
26.3%
|
|
| 2006 | 73 |
16.7%
|
|
| 2007 | 2 |
0.5%
|
|
| Sysmiss | 484 |