| Value | Category | Cases | |
|---|---|---|---|
| 2015 | 58 |
1.6%
|
|
| 2016 | 502 |
14.1%
|
|
| 2017 | 507 |
14.2%
|
|
| 2018 | 270 |
7.6%
|
|
| 9997 | 10 |
0.3%
|
|
| 9999 | NO RESPONSE | 18 |
0.5%
|
| Sysmiss | 2195 |
61.7%
|