| Value | Category | Cases | |
|---|---|---|---|
| 2017 | 5 |
0.5%
|
|
| 2018 | 59 |
5.4%
|
|
| 2019 | 57 |
5.2%
|
|
| 9999 | NO RESPONSE | 1 |
0.1%
|
| Sysmiss | 974 |
88.9%
|