| Value | Category | Cases | |
|---|---|---|---|
| 0 | unavailable | 3 |
1.1%
|
| 1 | Concrete | 207 |
78.1%
|
| 2 | stone | 45 |
17%
|
| 3 | Metallic | 6 |
2.3%
|
| 4 | other | 4 |
1.5%
|