| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1 | Mechanical treatment | 9 | 13 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                            
                        
                        
                            
                    
| 2 | Chemical treatment | 4 | 5 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                            
                        
                        
                            
                    
| 3 | Biological treatment | 5 | 9 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                            
                        
                        
                            
                    
| Sysmiss | 842 | 3255 |