| Value | Category | Cases | |
|---|---|---|---|
| 1 | 2017 or earlier | 147 |
21.9%
|
| 2 | 2018 | 205 |
30.6%
|
| 3 | 2019 | 156 |
23.3%
|
| 4 | 2020 | 58 |
8.7%
|
| 5 | 2021 | 104 |
15.5%
|
| Missing value | 1937 |