| Value | Category | Cases | |
|---|---|---|---|
| 2016 | 10 |
0.5%
|
|
| 2017 | 258 |
13.1%
|
|
| 2018 | 270 |
13.7%
|
|
| 2019 | 180 |
9.2%
|
|
| 9999 | NO RESPONSE | 1 |
0.1%
|
| Sysmiss | 1248 |
63.4%
|