| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 11 |
7.3%
|
|
| 2007 | 5 |
3.3%
|
|
| 2008 | 12 |
8%
|
|
| 2009 | 57 |
38%
|
|
| 2010 | 65 |
43.3%
|
|
| Sysmiss | 351 |