| Value | Category | Cases | |
|---|---|---|---|
| 2008 | 15 |
4.1%
|
|
| 2009 | 65 |
17.7%
|
|
| 2010 | 67 |
18.2%
|
|
| 2011 | 91 |
24.7%
|
|
| 2012 | 91 |
24.7%
|
|
| 2013 | 39 |
10.6%
|
|
| Sysmiss | 619 |