| Value | Category | Cases | |
|---|---|---|---|
| 1 | 2016 | 6 |
20%
|
| 2 | 2017 | 3 |
10%
|
| 3 | 2018 | 13 |
43.3%
|
| 4 | 2019 | 8 |
26.7%
|
| d | Don't know | 0 |
0%
|
| o | Other | 0 |
0%
|
| r | Refused to answer | 0 |
0%
|
| Sysmiss | 1473 |