| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1 | 9 |
0.5%
|
| 2 | 15 | 1 |
0.1%
|
| 3 | 2 | 7 |
0.4%
|
| 4 | 3 | 5 |
0.3%
|
| Missing value | 1960 |
98.9%
|