| Value | Category | Cases | |
|---|---|---|---|
| 2006 | in 2006 | 7 |
8.8%
|
| 2007 | in 2007 | 9 |
11.3%
|
| 2008 | in 2008 | 31 |
38.8%
|
| 2009 | in 2009 | 33 |
41.3%
|
| Sysmiss | 1117 |