| Value | Category | Cases | |
|---|---|---|---|
| 2016 | 76 |
4.9%
|
|
| 2017 | 233 |
14.9%
|
|
| 2018 | 256 |
16.4%
|
|
| 2019 | 8 |
0.5%
|
|
| 9999 | NO RESPONSE | 2 |
0.1%
|
| Sysmiss | 989 |
63.2%
|