| Value | Category | Cases | |
|---|---|---|---|
| 2013 | 6 |
1.9%
|
|
| 2014 | 57 |
17.7%
|
|
| 2015 | 35 |
10.9%
|
|
| 2016 | 12 |
3.7%
|
|
| 2017 | 2 |
0.6%
|
|
| 2018 | 6 |
1.9%
|
|
| Missing value | 204 |
63.4%
|