| Value | Category | Cases | |
|---|---|---|---|
| 1 | Earth/mud | 2460 | 
                                    
                                    66.2%
                                 | 
| 2 | Wood | 107 | 
                                    
                                    2.9%
                                 | 
| 3 | Stone/Brick | 12 | 
                                    
                                    0.3%
                                 | 
| 4 | Cement/Concrete | 1123 | 
                                    
                                    30.2%
                                 | 
| 5 | Other | 12 | 
                                    
                                    0.3%
                                 | 
| Sysmiss | 6 |