| Value | Category | Cases | |
|---|---|---|---|
| 2016 | 1 |
0.1%
|
|
| 2017 | 232 |
16.8%
|
|
| 2018 | 228 |
16.5%
|
|
| 2019 | 205 |
14.9%
|
|
| 9999 | NO RESPONSE | 2 |
0.1%
|
| Sysmiss | 710 |
51.5%
|