| Value | Category | Cases | |
|---|---|---|---|
| 2017 | 43 |
3.9%
|
|
| 2018 | 99 |
9%
|
|
| 2019 | 58 |
5.3%
|
|
| 9999 | NO RESPONSE | 3 |
0.3%
|
| Sysmiss | 893 |
81.5%
|