| Value | Category | Cases | |
|---|---|---|---|
| 2016 | 10 |
0.5%
|
|
| 2017 | 256 |
13%
|
|
| 2018 | 263 |
13.4%
|
|
| 2019 | 176 |
8.9%
|
|
| 9999 | NO RESPONSE | 1 |
0.1%
|
| Sysmiss | 1261 |
64.1%
|