| Value | Category | Cases | |
|---|---|---|---|
| 1 | Open | 7433 |
28.6%
|
| 2 | Wood | 9496 |
36.5%
|
| 3 | Cement | 8257 |
31.7%
|
| 4 | Tin and iron | 290 |
1.1%
|
| 5 | Others | 542 |
2.1%
|
| 9 | 187 |