| Value | Category | Cases | |
|---|---|---|---|
| 2015 | 618 |
6.1%
|
|
| 2016 | 1585 |
15.6%
|
|
| 2017 | 1858 |
18.3%
|
|
| 2018 | 430 |
4.2%
|
|
| 9999 | NO RESPONSE | 22 |
0.2%
|
| Sysmiss | 5643 |
55.6%
|