| Value | Category | Cases | |
|---|---|---|---|
| 1 | Natural: EARTH | 3881 |
55.8%
|
| 2 | Natural: DUNG | 472 |
6.8%
|
| 3 | Rudimentary mat; WOOD, TIMER | 2007 |
28.9%
|
| 4 | Fully processed: Concrete | 431 |
6.2%
|
| 5 | OTHER | 165 |
2.4%
|
| Sysmiss | 9504 |