| Value | Category | Cases | |
|---|---|---|---|
| 2016 | 613 |
9.9%
|
|
| 2017 | 964 |
15.5%
|
|
| 2018 | 1061 |
17%
|
|
| 2019 | 137 |
2.2%
|
|
| 9999 | NO RESPONSE | 6 |
0.1%
|
| Sysmiss | 3442 |
55.3%
|