| Value | Category | Cases | |
|---|---|---|---|
| 1 | 01. Concrete | 31 | 
                                    
                                    0.4%
                                 | 
| 2 | 02. Wood | 116 | 
                                    
                                    1.5%
                                 | 
| 3 | 03. Metal | 1711 | 
                                    
                                    22.5%
                                 | 
| 4 | 04. Tiles | 5184 | 
                                    
                                    68%
                                 | 
| 5 | 05. Asbestos | 238 | 
                                    
                                    3.1%
                                 | 
| 6 | 06. Foliage | 320 | 
                                    
                                    4.2%
                                 | 
| 7 | 07. Other | 1 | 
                                    
                                    0%
                                 | 
| 98 | 98. DK | 1 | 
                                    
                                    0%
                                 | 
| 99 | 99. Miss | 18 | 
                                    
                                    0.2%
                                 |