| Value | Category | Cases | |
|---|---|---|---|
| 2005 | 1 |
5.9%
|
|
| 2006 | 4 |
23.5%
|
|
| 2007 | 6 |
35.3%
|
|
| 2008 | 3 |
17.6%
|
|
| 2009 | 3 |
17.6%
|
|
| Sysmiss | 169 |