| Value | Category | Cases | |
|---|---|---|---|
| 2015 | 33 |
0.3%
|
|
| 2016 | 1365 |
13.4%
|
|
| 2017 | 1646 |
16.2%
|
|
| 2018 | 321 |
3.2%
|
|
| 9999 | NO RESPONSE | 22 |
0.2%
|
| Sysmiss | 6769 |
66.7%
|