| Value | Category | Cases | |
|---|---|---|---|
| 2012 | 1 |
6.3%
|
|
| 2013 | 8 |
50%
|
|
| 2014 | 5 |
31.3%
|
|
| 2015 | 2 |
12.5%
|
|
| Sysmiss | 184 |