| Value | Category | Cases | |
|---|---|---|---|
| 1 | Natural: EARTH | 2615 |
53.9%
|
| 2 | Natural: DUNG | 472 |
9.7%
|
| 3 | Rudimentary mat; WOOD, TIMER | 1313 |
27.1%
|
| 4 | Fully processed: Concrete | 264 |
5.4%
|
| 5 | OTHER | 189 |
3.9%
|
| Sysmiss | 6346 |