| Value | Category | Cases | |
|---|---|---|---|
| 2008 | 25 |
6.7%
|
|
| 2009 | 71 |
19.1%
|
|
| 2010 | 74 |
19.9%
|
|
| 2011 | 84 |
22.6%
|
|
| 2012 | 91 |
24.5%
|
|
| 2013 | 27 |
7.3%
|
|
| Sysmiss | 615 |