| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 1 |
0.6%
|
|
| 2007 | 2 |
1.1%
|
|
| 2008 | 11 |
6.3%
|
|
| 2009 | 36 |
20.6%
|
|
| 2010 | 29 |
16.6%
|
|
| 2011 | 23 |
13.1%
|
|
| 2012 | 14 |
8%
|
|
| 2013 | 28 |
16%
|
|
| 2014 | 13 |
7.4%
|
|
| 2015 | 14 |
8%
|
|
| 2016 | 4 |
2.3%
|
|
| Sysmiss | 57 |