| Value | Category | Cases | |
|---|---|---|---|
| 2015 | 4 |
0.3%
|
|
| 2016 | 234 |
15%
|
|
| 2017 | 277 |
17.7%
|
|
| 2018 | 237 |
15.2%
|
|
| 2019 | 9 |
0.6%
|
|
| 9999 | NO RESPONSE | 2 |
0.1%
|
| Sysmiss | 801 |
51.2%
|