| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 17 | 
                                    
                                    0.8%
                                 | 
| 1 | yes | 2206 | 
                                    
                                    98%
                                 | 
| 8 | don't know | 25 | 
                                    
                                    1.1%
                                 | 
| 9 | 2 | 
                                    
                                    0.1%
                                 | |
| 11 | .Z | 5989 |