| Value | Category | Cases | |
|---|---|---|---|
| 0 | not given | 6 |
15%
|
| 2016 | 2016 | 12 |
30%
|
| 2017 | 2017 | 8 |
20%
|
| 2018 | 2018 | 4 |
10%
|
| 2019 | 2019 | 2 |
5%
|
| 2020 | 2020 | 0 |
0%
|
| 4444 | marked on card | 6 |
15%
|
| 9998 | don't know/incomplete | 2 |
5%
|
| Sysmiss | 14594 |