| Value | Category | Cases | |
|---|---|---|---|
| 2008 | 4 |
1.7%
|
|
| 2009 | 22 |
9.2%
|
|
| 2010 | 25 |
10.5%
|
|
| 2011 | 84 |
35.1%
|
|
| 2012 | 83 |
34.7%
|
|
| 2013 | 21 |
8.8%
|
|
| Sysmiss | 748 |