| Value | Category | Cases | |
|---|---|---|---|
| 2017 | 5 |
0.2%
|
|
| 2018 | 209 |
7.1%
|
|
| 2019 | 223 |
7.6%
|
|
| 9999 | NO RESPONSE | 1 |
0%
|
| Sysmiss | 2487 |
85%
|