| Value | Category | Cases | |
|---|---|---|---|
| 2016 | 63 |
2.2%
|
|
| 2017 | 373 |
12.8%
|
|
| 2018 | 433 |
14.8%
|
|
| 2019 | 332 |
11.4%
|
|
| 9999 | NO RESPONSE | 4 |
0.1%
|
| Sysmiss | 1720 |
58.8%
|