| Value | Category | Cases | |
|---|---|---|---|
| 1 | Very dirty | 2 | 
                                    
                                    0.6%
                                 | 
| 2 | Dirty | 80 | 
                                    
                                    23.3%
                                 | 
| 3 | Same as other | 156 | 
                                    
                                    45.5%
                                 | 
| 4 | Clean | 103 | 
                                    
                                    30%
                                 | 
| 5 | Very clean | 2 | 
                                    
                                    0.6%
                                 |