| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 8 |
5.1%
|
|
| 2007 | 23 |
14.6%
|
|
| 2008 | 24 |
15.2%
|
|
| 2009 | 78 |
49.4%
|
|
| 2010 | 25 |
15.8%
|
|
| Sysmiss | 1252 |