| Value | Category | Cases | |
|---|---|---|---|
| 2013 | 1 |
1.5%
|
|
| 2014 | 2 |
3%
|
|
| 2015 | 31 |
46.3%
|
|
| 2016 | 21 |
31.3%
|
|
| 2017 | 12 |
17.9%
|
|
| Sysmiss | 939 |