| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 1 |
3.6%
|
|
| 2007 | 4 |
14.3%
|
|
| 2008 | 2 |
7.1%
|
|
| 2009 | 11 |
39.3%
|
|
| 2010 | 10 |
35.7%
|
|
| Sysmiss | 182 |