| Value | Category | Cases | |
|---|---|---|---|
| 2008 | 3 |
5.8%
|
|
| 2009 | 13 |
25%
|
|
| 2010 | 10 |
19.2%
|
|
| 2011 | 26 |
50%
|
|
| Sysmiss | 1280 |