| Value | Category | Cases | |
|---|---|---|---|
| 1 | Dirt | 6259 |
27.9%
|
| 2 | Wood | 230 |
1%
|
| 3 | Cement | 12363 |
55.2%
|
| 4 | Cement with additional covering | 3552 |
15.9%
|
| Sysmiss | 42 |