| Value | Category | Cases | |
|---|---|---|---|
| 2008 | 18 |
4.6%
|
|
| 2009 | 73 |
18.5%
|
|
| 2010 | 78 |
19.7%
|
|
| 2011 | 86 |
21.8%
|
|
| 2012 | 105 |
26.6%
|
|
| 2013 | 35 |
8.9%
|
|
| Sysmiss | 592 |