| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 221 | 
                                                                 
                                    
                                    2.1%
                                 
                                                             | 
                                                        
                    
| 1 | Yes | 1421 | 
                                                                 
                                    
                                    13.3%
                                 
                                                             | 
                                                        
                    
| 2 | No | 9030 | 
                                                                 
                                    
                                    84.6%
                                 
                                                             |