| Value | Category | Cases | |
|---|---|---|---|
| 1 | Natural: EARTH | 2268 |
46.7%
|
| 2 | Natural: DUNG | 744 |
15.3%
|
| 3 | Rudimentary mat; WOOD, TIMER | 1359 |
28%
|
| 4 | Fully processed: Concrete | 279 |
5.7%
|
| 5 | OTHER | 203 |
4.2%
|
| Sysmiss | 6346 |