| Value | Category | Cases | |
|---|---|---|---|
| 2008 | 3 |
1.3%
|
|
| 2009 | 18 |
7.8%
|
|
| 2010 | 26 |
11.3%
|
|
| 2011 | 75 |
32.5%
|
|
| 2012 | 80 |
34.6%
|
|
| 2013 | 29 |
12.6%
|
|
| Sysmiss | 756 |