| Value | Category | Cases | |
|---|---|---|---|
| 1 | Stone/Sand | 877 |
13.2%
|
| 2 | Untreated wood | 602 |
9%
|
| 3 | Treated timber | 2138 |
32.1%
|
| 4 | Concrete | 2992 |
44.9%
|
| 5 | Tiles | 56 |
0.8%
|
| 9 | 63 | ||
| Sysmiss | 19477 |