| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 7645 | 
                                    
                                    92.8%
                                 | 
| 1 | yes | 396 | 
                                    
                                    4.8%
                                 | 
| 8 | don't know | 196 | 
                                    
                                    2.4%
                                 | 
| 9 | 2 | 
                                    
                                    0%
                                 |