| Value | Category | Cases | |
|---|---|---|---|
| 2015 | 1168 |
11.5%
|
|
| 2016 | 1713 |
16.9%
|
|
| 2017 | 1819 |
17.9%
|
|
| 2018 | 360 |
3.5%
|
|
| 9999 | NO RESPONSE | 22 |
0.2%
|
| Sysmiss | 5074 |
50%
|