| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 143 | 
                                                                 
                                    
                                    1.3%
                                 
                                                             | 
                                                        
                    
| 1 | Yes | 3302 | 
                                                                 
                                    
                                    30.9%
                                 
                                                             | 
                                                        
                    
| 2 | No | 7227 | 
                                                                 
                                    
                                    67.7%
                                 
                                                             |