| Value | Category | Cases | |
|---|---|---|---|
| 2008 | 10 |
2.8%
|
|
| 2009 | 65 |
18.1%
|
|
| 2010 | 63 |
17.5%
|
|
| 2011 | 89 |
24.7%
|
|
| 2012 | 91 |
25.3%
|
|
| 2013 | 42 |
11.7%
|
|
| Sysmiss | 627 |