| Value | Category | Cases | |
|---|---|---|---|
| 2016 | 81 |
5.2%
|
|
| 2017 | 252 |
16.1%
|
|
| 2018 | 281 |
18%
|
|
| 2019 | 13 |
0.8%
|
|
| 9999 | NO RESPONSE | 1 |
0.1%
|
| Sysmiss | 936 |
59.8%
|