| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 7265 | 
                                    
                                    88.2%
                                 | 
| 1 | yes | 869 | 
                                    
                                    10.5%
                                 | 
| 8 | don't know | 103 | 
                                    
                                    1.3%
                                 | 
| 9 | 2 | 
                                    
                                    0%
                                 |