| Value | Category | Cases | |
|---|---|---|---|
| 2015 | 851 |
8.4%
|
|
| 2016 | 1652 |
16.3%
|
|
| 2017 | 1839 |
18.1%
|
|
| 2018 | 422 |
4.2%
|
|
| 9999 | NO RESPONSE | 22 |
0.2%
|
| Sysmiss | 5370 |
52.9%
|