| Value | Category | Cases | |
|---|---|---|---|
| 1 | Stone/Sand | 297 |
14.8%
|
| 2 | Untreated wood | 180 |
9%
|
| 3 | Treated timber | 646 |
32.2%
|
| 4 | Concrete | 862 |
42.9%
|
| 5 | Tiles | 23 |
1.1%
|
| 9 | 20 | ||
| Sysmiss | 24177 |