| Value | Category | Cases | |
|---|---|---|---|
| 2008 | 16 |
4.1%
|
|
| 2009 | 66 |
17.1%
|
|
| 2010 | 68 |
17.6%
|
|
| 2011 | 97 |
25.1%
|
|
| 2012 | 98 |
25.3%
|
|
| 2013 | 42 |
10.9%
|
|
| Sysmiss | 600 |