| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 4698 | 
                                    
                                    57%
                                 | 
| 1 | yes | 3454 | 
                                    
                                    41.9%
                                 | 
| 8 | don't know | 85 | 
                                    
                                    1%
                                 | 
| 9 | 2 | 
                                    
                                    0%
                                 |