| Value | Category | Cases | |
|---|---|---|---|
| 2010 | 8 |
7.7%
|
|
| 2011 | 6 |
5.8%
|
|
| 2012 | 16 |
15.4%
|
|
| 2013 | 37 |
35.6%
|
|
| 2014 | 37 |
35.6%
|
|
| Sysmiss | 56 |