| Value | Category | Cases | |
|---|---|---|---|
| 1 | 2016 | 3 |
15%
|
| 2 | 2017 | 1 |
5%
|
| 3 | 2018 | 12 |
60%
|
| 4 | 2019 | 4 |
20%
|
| d | Don't know | 0 |
0%
|
| o | Other | 0 |
0%
|
| r | Refused to answer | 0 |
0%
|
| Sysmiss | 1483 |