| Value | Category | Cases | |
|---|---|---|---|
| 1995 | 1 |
0.2%
|
|
| 1996 | 3 |
0.6%
|
|
| 1997 | 6 |
1.1%
|
|
| 1998 | 7 |
1.3%
|
|
| 1999 | 20 |
3.8%
|
|
| 2000 | 20 |
3.8%
|
|
| 2001 | 36 |
6.8%
|
|
| 2002 | 47 |
8.8%
|
|
| 2003 | 77 |
14.4%
|
|
| 2004 | 94 |
17.6%
|
|
| 2005 | 132 |
24.8%
|
|
| 2006 | 89 |
16.7%
|
|
| 2007 | 1 |
0.2%
|
|
| Sysmiss | 389 |