| Value | Category | Cases | |
|---|---|---|---|
| 1 | Natural: EARTH | 3767 |
57.2%
|
| 2 | Natural: DUNG | 377 |
5.7%
|
| 3 | Rudimentary mat; WOOD, TIMER | 1769 |
26.9%
|
| 4 | Fully processed: Concrete | 430 |
6.5%
|
| 5 | OTHER | 238 |
3.6%
|