| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 2 |
2.4%
|
|
| 2001 | 3 |
3.5%
|
|
| 2002 | 14 |
16.5%
|
|
| 2003 | 12 |
14.1%
|
|
| 2004 | 26 |
30.6%
|
|
| 2005 | 27 |
31.8%
|
|
| 2006 | 1 |
1.2%
|
|
| Sysmiss | 8049 |