| Value | Category | Cases | |
|---|---|---|---|
| 1999 | 2 |
1.7%
|
|
| 2000 | 2 |
1.7%
|
|
| 2001 | 3 |
2.6%
|
|
| 2002 | 10 |
8.5%
|
|
| 2003 | 13 |
11.1%
|
|
| 2004 | 24 |
20.5%
|
|
| 2005 | 31 |
26.5%
|
|
| 2006 | 32 |
27.4%
|
|
| Sysmiss | 805 |