| Value | Category | Cases | |
|---|---|---|---|
| 1 | 2017 or earlier | 44 |
30.8%
|
| 2 | 2018 | 11 |
7.7%
|
| 3 | 2019 | 15 |
10.5%
|
| 4 | 2020 | 21 |
14.7%
|
| 5 | 2021 | 52 |
36.4%
|
| Missing value | 293 |