| Value | Category | Cases | |
|---|---|---|---|
| 2008 | 30 |
7.6%
|
|
| 2009 | 79 |
20.1%
|
|
| 2010 | 77 |
19.6%
|
|
| 2011 | 86 |
21.9%
|
|
| 2012 | 99 |
25.2%
|
|
| 2013 | 22 |
5.6%
|
|
| Sysmiss | 594 |