| Value | Category | Cases | |
|---|---|---|---|
| 2016 | 1 |
0.1%
|
|
| 2017 | 7 |
0.6%
|
|
| 2018 | 55 |
5%
|
|
| 2019 | 66 |
6%
|
|
| 9999 | NO RESPONSE | 2 |
0.2%
|
| Sysmiss | 965 |
88%
|