| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 4830 | 
                                    
                                    58.6%
                                 | 
| 1 | yes | 3366 | 
                                    
                                    40.9%
                                 | 
| 8 | don't know | 41 | 
                                    
                                    0.5%
                                 | 
| 9 | 2 | 
                                    
                                    0%
                                 |