| Value | Category | Cases | |
|---|---|---|---|
| 2015 | 834 |
8.2%
|
|
| 2016 | 1649 |
16.2%
|
|
| 2017 | 1833 |
18%
|
|
| 2018 | 411 |
4%
|
|
| 9999 | NO RESPONSE | 22 |
0.2%
|
| Sysmiss | 5407 |
53.2%
|