| Value | Category | Cases | |
|---|---|---|---|
| 2008 | 3 |
2.9%
|
|
| 2009 | 4 |
3.8%
|
|
| 2010 | 7 |
6.7%
|
|
| 2011 | 6 |
5.7%
|
|
| 2012 | 5 |
4.8%
|
|
| 2013 | 12 |
11.4%
|
|
| 2014 | 21 |
20%
|
|
| 2015 | 43 |
41%
|
|
| 2016 | 4 |
3.8%
|
|
| Sysmiss | 127 |