| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 1 | Impassable | 88 | 
                                                                 
                                    
                                    3.7%
                                 
                                                             | 
                                                        
                    
| 2 | Very poor | 416 | 
                                                                 
                                    
                                    17.3%
                                 
                                                             | 
                                                        
                    
| 3 | Poor | 408 | 
                                                                 
                                    
                                    17%
                                 
                                                             | 
                                                        
                    
| 4 | Fair | 664 | 
                                                                 
                                    
                                    27.7%
                                 
                                                             | 
                                                        
                    
| 5 | Good | 576 | 
                                                                 
                                    
                                    24%
                                 
                                                             | 
                                                        
                    
| 6 | Very good | 248 | 
                                                                 
                                    
                                    10.3%
                                 
                                                             |