| Value | Category | Cases | |
|---|---|---|---|
| 2008 | 6 |
5.7%
|
|
| 2009 | 19 |
17.9%
|
|
| 2010 | 20 |
18.9%
|
|
| 2011 | 17 |
16%
|
|
| 2012 | 10 |
9.4%
|
|
| 2013 | 10 |
9.4%
|
|
| 2014 | 12 |
11.3%
|
|
| 2015 | 8 |
7.5%
|
|
| 2016 | 4 |
3.8%
|
|
| Sysmiss | 126 |