| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 7297 | 
                                    
                                    88.6%
                                 | 
| 1 | yes | 830 | 
                                    
                                    10.1%
                                 | 
| 8 | don't know | 110 | 
                                    
                                    1.3%
                                 | 
| 9 | 2 | 
                                    
                                    0%
                                 |