| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 5453 | 
                                    
                                    66.2%
                                 | 
| 1 | yes | 2747 | 
                                    
                                    33.3%
                                 | 
| 8 | don't know | 37 | 
                                    
                                    0.4%
                                 | 
| 9 | 2 | 
                                    
                                    0%
                                 |