| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2372 | 
                                                                 
                                    
                                    22.2%
                                 
                                                             | 
                                                        
                    
| 0 | 199 | 
                                                                 
                                    
                                    1.9%
                                 
                                                             | 
                                                        
                    |
| 1 | 6005 | 
                                                                 
                                    
                                    56.3%
                                 
                                                             | 
                                                        
                    |
| 2 | 1606 | 
                                                                 
                                    
                                    15%
                                 
                                                             | 
                                                        
                    |
| 3 | 299 | 
                                                                 
                                    
                                    2.8%
                                 
                                                             | 
                                                        
                    |
| 4 | 122 | 
                                                                 
                                    
                                    1.1%
                                 
                                                             | 
                                                        
                    |
| 5 | 39 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 6 | 12 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 7 | 3 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 8 | 7 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 9 | 1 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 10 | 2 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 12 | 1 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 15 | 2 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 20 | 2 | 
                                                                 
                                    
                                    0%
                                 
                                                             |