| Value | Category | Cases | |
|---|---|---|---|
| 2011 | 1 |
1.5%
|
|
| 2012 | 1 |
1.5%
|
|
| 2013 | 9 |
13.2%
|
|
| 2014 | 39 |
57.4%
|
|
| 2015 | 18 |
26.5%
|
|
| Sysmiss | 211 |