| Value | Category | Cases | |
|---|---|---|---|
| 2016 | 1 |
0.1%
|
|
| 2017 | 187 |
12%
|
|
| 2018 | 218 |
13.9%
|
|
| 2019 | 34 |
2.2%
|
|
| 9999 | NO RESPONSE | 4 |
0.3%
|
| Sysmiss | 1120 |
71.6%
|