| Value | Category | Cases | |
|---|---|---|---|
| 1 | brick, s | 2051 |
28.5%
|
| 2 | concrete | 2154 |
29.9%
|
| 3 | timber | 478 |
6.6%
|
| 4 | clay and | 1695 |
23.5%
|
| 5 | other | 831 |
11.5%
|
| Sysmiss | 15 |