| Value | Category | Cases | |
|---|---|---|---|
| 2016 | 3 |
0.1%
|
|
| 2017 | 23 |
1.1%
|
|
| 2018 | 38 |
1.7%
|
|
| 9999 | NO RESPONSE | 1 |
0%
|
| Sysmiss | 2124 |
97%
|