| Value |
Category |
| 1 |
Earth |
| 2 |
Rammed earth |
| 3 |
Cement screed |
| 4 |
Concrete |
| 5 |
Tiles |
| 6 |
Brick |
| 7 |
Stone |
| 8 |
Wood |
Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.