| Value | Category | Cases | |
|---|---|---|---|
| -1 | missing | 0 |
0%
|
| 1 | earth | 16009 |
33.3%
|
| 2 | gravel | 6133 |
12.8%
|
| 3 | stone | 1848 |
3.8%
|
| 4 | muram | 1939 |
4%
|
| 5 | paved/ tarred | 19751 |
41.1%
|
| 6 | concrete | 2308 |
4.8%
|
| 7 | none of above | 96 |
0.2%
|