| Value | Category | Cases | |
|---|---|---|---|
| 1999 | 1 |
0.9%
|
|
| 2000 | 3 |
2.6%
|
|
| 2001 | 5 |
4.3%
|
|
| 2002 | 11 |
9.6%
|
|
| 2003 | 12 |
10.4%
|
|
| 2004 | 41 |
35.7%
|
|
| 2005 | 36 |
31.3%
|
|
| 2006 | 6 |
5.2%
|
|
| Sysmiss | 20 |