| Value | Category | Cases | |
|---|---|---|---|
| 2012 | 2 |
3.8%
|
|
| 2013 | 6 |
11.5%
|
|
| 2014 | 10 |
19.2%
|
|
| 2015 | 34 |
65.4%
|
|
| Sysmiss | 1448 |