| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 1 |
1.5%
|
|
| 2001 | 2 |
3%
|
|
| 2002 | 21 |
31.8%
|
|
| 2003 | 21 |
31.8%
|
|
| 2004 | 10 |
15.2%
|
|
| 2005 | 9 |
13.6%
|
|
| 2006 | 2 |
3%
|
|
| Sysmiss | 8068 |