| Value | Category | Cases | |
|---|---|---|---|
| 2007 | 2 |
3.1%
|
|
| 2008 | 1 |
1.5%
|
|
| 2009 | 3 |
4.6%
|
|
| 2010 | 3 |
4.6%
|
|
| 2011 | 11 |
16.9%
|
|
| 2012 | 10 |
15.4%
|
|
| 2013 | 32 |
49.2%
|
|
| 2014 | 3 |
4.6%
|
|
| Sysmiss | 44 |