| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1641 | 
                                                                 
                                    
                                    15.4%
                                 
                                                             | 
                                                        
                    
| 1 | 15 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 2 | 5 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 3 | 2 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 4 | 3 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 5 | 5 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 6 | 16 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 7 | 7 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 8 | 91 | 
                                                                 
                                    
                                    0.9%
                                 
                                                             | 
                                                        
                    |
| 9 | 27 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 10 | 325 | 
                                                                 
                                    
                                    3%
                                 
                                                             | 
                                                        
                    |
| 11 | 404 | 
                                                                 
                                    
                                    3.8%
                                 
                                                             | 
                                                        
                    |
| 12 | 8131 | 
                                                                 
                                    
                                    76.2%
                                 
                                                             |