| Value | Category | Cases | |
|---|---|---|---|
| 2015 | 454 |
4.5%
|
|
| 2016 | 1593 |
15.7%
|
|
| 2017 | 1831 |
18%
|
|
| 2018 | 371 |
3.7%
|
|
| 9999 | NO RESPONSE | 22 |
0.2%
|
| Sysmiss | 5885 |
57.9%
|