| Value | Category | Cases | |
|---|---|---|---|
| 2015 | 644 |
6.3%
|
|
| 2016 | 1598 |
15.7%
|
|
| 2017 | 1871 |
18.4%
|
|
| 2018 | 437 |
4.3%
|
|
| 9999 | NO RESPONSE | 22 |
0.2%
|
| Sysmiss | 5584 |
55%
|