| Value |
Category |
| 1 |
Plastic sheets, or branches and twigs |
| 2 |
Grass |
| 3 |
Stone or slate |
| 4 |
Iron sheets |
| 5 |
Brick tiles |
| 6 |
Concrete |
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.