| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 7 |
10.8%
|
|
| 2007 | 9 |
13.8%
|
|
| 2008 | 17 |
26.2%
|
|
| 2009 | 9 |
13.8%
|
|
| 2010 | 23 |
35.4%
|
|
| Sysmiss | 145 |