| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1 | Traffic | 430 | 446 | 
                                                                 
                                    
                                    16.4%
                                 
                                                             | 
                            
                        
                        
                            
                    
| 2 | Planes | 6 | 5 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                            
                        
                        
                            
                    
| 3 | Queries and stone cutting | 9 | 9 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                            
                        
                        
                            
                    
| 4 | Construction | 36 | 45 | 
                                                                 
                                    
                                    1.7%
                                 
                                                             | 
                            
                        
                        
                            
                    
| 5 | Industrial activities | 77 | 74 | 
                                                                 
                                    
                                    2.7%
                                 
                                                             | 
                            
                        
                        
                            
                    
| 6 | Others | 161 | 178 | 
                                                                 
                                    
                                    6.5%
                                 
                                                             | 
                            
                        
                        
                            
                    
| Sysmiss | 1995 | 1957 |