| Value | Category | Cases | |
|---|---|---|---|
| 1998 | 1 |
0.6%
|
|
| 1999 | 2 |
1.3%
|
|
| 2000 | 10 |
6.5%
|
|
| 2001 | 4 |
2.6%
|
|
| 2002 | 11 |
7.1%
|
|
| 2003 | 32 |
20.8%
|
|
| 2004 | 54 |
35.1%
|
|
| 2005 | 36 |
23.4%
|
|
| 2006 | 4 |
2.6%
|
|
| Sysmiss | 9980 |