| Value | Category | Cases | |
|---|---|---|---|
| 2016 | 41 |
1.9%
|
|
| 2017 | 96 |
4.4%
|
|
| 2018 | 222 |
10.1%
|
|
| 2019 | 3 |
0.1%
|
|
| 9999 | NO RESPONSE | 2 |
0.1%
|
| Sysmiss | 1825 |
83.4%
|