| Value | Category | Cases | |
|---|---|---|---|
| 1 | 2017 or earlier | 23 |
30.7%
|
| 2 | 2018 | 22 |
29.3%
|
| 3 | 2019 | 17 |
22.7%
|
| 4 | 2020 | 3 |
4%
|
| 5 | 2021 | 10 |
13.3%
|
| Missing value | 33 |