| Value | Category | Cases | |
|---|---|---|---|
| 11 | Earth, sand, soil | 743 |
37.2%
|
| 12 | Dung | 8 |
0.4%
|
| 21 | Wood planks | 1132 |
56.6%
|
| 32 | Concrete, vinyl or asphalt strips | 18 |
0.9%
|
| 34 | Cement | 78 |
3.9%
|
| 96 | Other | 3 |
0.2%
|
| Sysmiss | 18 |
0.9%
|