| Value | Category | Cases | |
|---|---|---|---|
| 1995 | 1 |
0.2%
|
|
| 1996 | 4 |
0.8%
|
|
| 1997 | 5 |
1%
|
|
| 1998 | 5 |
1%
|
|
| 1999 | 15 |
3.1%
|
|
| 2000 | 17 |
3.5%
|
|
| 2001 | 32 |
6.7%
|
|
| 2002 | 44 |
9.1%
|
|
| 2003 | 61 |
12.7%
|
|
| 2004 | 93 |
19.3%
|
|
| 2005 | 116 |
24.1%
|
|
| 2006 | 85 |
17.7%
|
|
| 2007 | 3 |
0.6%
|
|
| Sysmiss | 441 |