| Value | Category | Cases | |
|---|---|---|---|
| 2001 | 1 |
1.8%
|
|
| 2003 | 13 |
22.8%
|
|
| 2004 | 9 |
15.8%
|
|
| 2005 | 8 |
14%
|
|
| 2006 | 13 |
22.8%
|
|
| 2007 | 13 |
22.8%
|
|
| Sysmiss | 149 |