| Value | Category | Cases | |
|---|---|---|---|
| 1 | 2017 or earlier | 506 |
22.9%
|
| 2 | 2018 | 423 |
19.1%
|
| 3 | 2019 | 583 |
26.4%
|
| 4 | 2020 | 426 |
19.3%
|
| 5 | 2021 | 272 |
12.3%
|
| Missing value | 45 |