| Value | Category | Cases | |
|---|---|---|---|
| 2008 | 21 |
5.6%
|
|
| 2009 | 68 |
18.1%
|
|
| 2010 | 76 |
20.3%
|
|
| 2011 | 84 |
22.4%
|
|
| 2012 | 94 |
25.1%
|
|
| 2013 | 32 |
8.5%
|
|
| Sysmiss | 612 |