| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 1 |
0.4%
|
|
| 2007 | 2 |
0.9%
|
|
| 2008 | 8 |
3.5%
|
|
| 2009 | 25 |
10.9%
|
|
| 2010 | 23 |
10%
|
|
| 2011 | 13 |
5.7%
|
|
| 2012 | 24 |
10.5%
|
|
| 2013 | 40 |
17.5%
|
|
| 2014 | 29 |
12.7%
|
|
| 2015 | 57 |
24.9%
|
|
| 2016 | 7 |
3.1%
|
|
| Sysmiss | 3 |