| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 1 |
1.4%
|
|
| 2007 | 1 |
1.4%
|
|
| 2008 | 10 |
14.1%
|
|
| 2009 | 26 |
36.6%
|
|
| 2010 | 33 |
46.5%
|
|
| Sysmiss | 239 |