| Value | Category | Cases | |
|---|---|---|---|
| 1 | Yes | 31110 | 
                                    
                                    18.9%
                                 | 
| 2 | No, never | 133874 | 
                                    
                                    81.1%
                                 | 
| 7 | N/A | 315077 | |
| 8 | Invalid | 142 | |
| 9 | Missing | 5287 |