| Value | Category | Cases | |
|---|---|---|---|
| 1 | grass | 775 |
15.8%
|
| 2 | iron sheets | 3594 |
73.5%
|
| 3 | clay tiles | 60 |
1.2%
|
| 4 | concrete | 74 |
1.5%
|
| 5 | plastic sheeting | 50 |
1%
|
| 6 | abestos sheet | 160 |
3.3%
|
| 7 | other (specify) | 180 |
3.7%
|
| Sysmiss | 36 |