| Value | Category | Cases | |
|---|---|---|---|
| 2008 | 1 |
0.3%
|
|
| 2009 | 40 |
11.7%
|
|
| 2010 | 62 |
18.2%
|
|
| 2011 | 83 |
24.3%
|
|
| 2012 | 89 |
26.1%
|
|
| 2013 | 66 |
19.4%
|
|
| Sysmiss | 646 |