| Value | Category | Cases | |
|---|---|---|---|
| 2017 | 31 |
2.8%
|
|
| 2018 | 86 |
7.8%
|
|
| 2019 | 55 |
5%
|
|
| 9999 | NO RESPONSE | 1 |
0.1%
|
| Sysmiss | 923 |
84.2%
|