| Value | Category | Cases | |
|---|---|---|---|
| 1 | 2017 or earlier | 655 |
57.9%
|
| 2 | 2018 | 266 |
23.5%
|
| 3 | 2019 | 198 |
17.5%
|
| 4 | 2020 | 4 |
0.4%
|
| 5 | 2021 | 9 |
0.8%
|
| Missing value | 14 |