| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 20 |
11.6%
|
|
| 2007 | 15 |
8.7%
|
|
| 2008 | 24 |
13.9%
|
|
| 2009 | 21 |
12.1%
|
|
| 2010 | 93 |
53.8%
|
|
| Sysmiss | 37 |