| Value | Category | Cases | |
|---|---|---|---|
| 1 | Mud | 4272 |
24.5%
|
| 2 | Concrete | 42 |
0.2%
|
| 3 | Wooden Poles | 1755 |
10.1%
|
| 4 | Metal poles | 38 |
0.2%
|
| 5 | Other | 208 |
1.2%
|
| 6 | None | 11105 |
63.7%
|
| Sysmiss | 850 |