| Value | Category | Cases | |
|---|---|---|---|
| 2013 | 8 |
4.8%
|
|
| 2014 | 18 |
10.8%
|
|
| 2015 | 19 |
11.4%
|
|
| 2016 | 17 |
10.2%
|
|
| 2017 | 28 |
16.8%
|
|
| 2018 | 27 |
16.2%
|
|
| 2019 | 50 |
29.9%
|
|
| Sysmiss | 1756 |