| Value | Category | Cases | |
|---|---|---|---|
| 2015 | 438 |
4.3%
|
|
| 2016 | 1599 |
15.7%
|
|
| 2017 | 1834 |
18.1%
|
|
| 2018 | 368 |
3.6%
|
|
| 9999 | NO RESPONSE | 22 |
0.2%
|
| Sysmiss | 5895 |
58%
|