| Value | Category | Cases | |
|---|---|---|---|
| 2013 | 6 |
25%
|
|
| 2014 | 6 |
25%
|
|
| 2015 | 8 |
33.3%
|
|
| 2016 | 4 |
16.7%
|
|
| Sysmiss | 12853 |