| Value | Category | Cases | |
|---|---|---|---|
| 1 | First quartile | 406 | 
                                                                 
                                    
                                    19.5%
                                 
                                                             | 
                                                        
                    
| 2 | Second quartile | 405 | 
                                                                 
                                    
                                    19.5%
                                 
                                                             | 
                                                        
                    
| 3 | Third quartile | 605 | 
                                                                 
                                    
                                    29.1%
                                 
                                                             | 
                                                        
                    
| 4 | Fourth quartile | 490 | 
                                                                 
                                    
                                    23.6%
                                 
                                                             | 
                                                        
                    
| 5 | Don't know | 153 | 
                                                                 
                                    
                                    7.4%
                                 
                                                             | 
                                                        
                    
| 6 | Refused | 18 | 
                                                                 
                                    
                                    0.9%
                                 
                                                             |