| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 6734 | 
                                                                 
                                    
                                    81.8%
                                 
                                                             | 
                                                        
                    
| 1 | yes | 1272 | 
                                                                 
                                    
                                    15.5%
                                 
                                                             | 
                                                        
                    
| 8 | don't know | 223 | 
                                                                 
                                    
                                    2.7%
                                 
                                                             | 
                                                        
                    
| 9 | 3 | 
                                                                 
                                    
                                    0%
                                 
                                                             |