| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 183 | 
                                                                 
                                    
                                    1.7%
                                 
                                                             | 
                                                        
                    
| 1 | Yes | 3379 | 
                                                                 
                                    
                                    31.7%
                                 
                                                             | 
                                                        
                    
| 2 | No | 7110 | 
                                                                 
                                    
                                    66.6%
                                 
                                                             |