| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. Cmnt/brck | 4471 | 
                                    
                                    58.7%
                                 | 
| 2 | 2. Wood | 2070 | 
                                    
                                    27.2%
                                 | 
| 3 | 3. Bamboo | 1035 | 
                                    
                                    13.6%
                                 | 
| 4 | 4. Other | 30 | 
                                    
                                    0.4%
                                 | 
| 9 | 9. Miss | 14 | 
                                    
                                    0.2%
                                 |