| Value | Category | Cases | |
|---|---|---|---|
| 2015 | 200 |
2%
|
|
| 2016 | 1227 |
12.1%
|
|
| 2017 | 741 |
7.3%
|
|
| 2018 | 71 |
0.7%
|
|
| 9999 | NO RESPONSE | 22 |
0.2%
|
| Sysmiss | 7895 |
77.7%
|