| Value | Category | Cases | |
|---|---|---|---|
| 2017 | 3 |
0.3%
|
|
| 2018 | 91 |
8.3%
|
|
| 2019 | 122 |
11.1%
|
|
| 9999 | NO RESPONSE | 1 |
0.1%
|
| Sysmiss | 879 |
80.2%
|