| Value | Category | Cases | |
|---|---|---|---|
| 1 | 2017 or earlier | 330 |
18%
|
| 2 | 2018 | 532 |
29%
|
| 3 | 2019 | 637 |
34.8%
|
| 4 | 2020 | 300 |
16.4%
|
| 5 | 2021 | 34 |
1.9%
|
| Missing value | 42 |