| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 123 | 
                                                                 
                                    
                                    7.1%
                                 
                                                             | 
                                                        
                    
| 1 | yes | 1610 | 
                                                                 
                                    
                                    92.4%
                                 
                                                             | 
                                                        
                    
| 8 | don't know | 9 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    
| 11 | .Z | 17012 |