| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 1 |
0.5%
|
|
| 2007 | 2 |
1%
|
|
| 2008 | 11 |
5.4%
|
|
| 2009 | 23 |
11.3%
|
|
| 2010 | 26 |
12.7%
|
|
| 2011 | 12 |
5.9%
|
|
| 2012 | 13 |
6.4%
|
|
| 2013 | 21 |
10.3%
|
|
| 2014 | 28 |
13.7%
|
|
| 2015 | 62 |
30.4%
|
|
| 2016 | 5 |
2.5%
|
|
| Sysmiss | 28 |