| Value | Category | Cases | |
|---|---|---|---|
| 2012 | 1 |
1.3%
|
|
| 2013 | 22 |
27.5%
|
|
| 2014 | 22 |
27.5%
|
|
| 2015 | 23 |
28.8%
|
|
| 2016 | 12 |
15%
|
|
| Sysmiss | 12797 |