| Value | Category | Cases | |
|---|---|---|---|
| 2007 | 3 |
1.4%
|
|
| 2008 | 3 |
1.4%
|
|
| 2009 | 5 |
2.3%
|
|
| 2010 | 6 |
2.7%
|
|
| 2011 | 10 |
4.5%
|
|
| 2012 | 16 |
7.3%
|
|
| 2013 | 28 |
12.7%
|
|
| 2014 | 88 |
40%
|
|
| 2015 | 61 |
27.7%
|
|
| Sysmiss | 972 |