| Value | Category | Cases | |
|---|---|---|---|
| 1 | 2017 or earlier | 64 |
59.3%
|
| 2 | 2018 | 37 |
34.3%
|
| 3 | 2019 | 7 |
6.5%
|
| 4 | 2020 | 0 |
0%
|
| Missing value | 13 |