| Value | Category | Cases | |
|---|---|---|---|
| 2007 | 3 |
1.8%
|
|
| 2008 | 14 |
8.4%
|
|
| 2009 | 37 |
22.2%
|
|
| 2010 | 31 |
18.6%
|
|
| 2011 | 16 |
9.6%
|
|
| 2012 | 14 |
8.4%
|
|
| 2013 | 20 |
12%
|
|
| 2014 | 13 |
7.8%
|
|
| 2015 | 15 |
9%
|
|
| 2016 | 4 |
2.4%
|
|
| Sysmiss | 65 |