| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 409 | 
                                                                 
                                    
                                    3.8%
                                 
                                                             | 
                                                        
                    
| 0 | 57 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 1 | 226 | 
                                                                 
                                    
                                    2.1%
                                 
                                                             | 
                                                        
                    |
| 2 | 989 | 
                                                                 
                                    
                                    9.3%
                                 
                                                             | 
                                                        
                    |
| 3 | 2127 | 
                                                                 
                                    
                                    19.9%
                                 
                                                             | 
                                                        
                    |
| 4 | 2551 | 
                                                                 
                                    
                                    23.9%
                                 
                                                             | 
                                                        
                    |
| 5 | 2097 | 
                                                                 
                                    
                                    19.6%
                                 
                                                             | 
                                                        
                    |
| 6 | 1369 | 
                                                                 
                                    
                                    12.8%
                                 
                                                             | 
                                                        
                    |
| 7 | 389 | 
                                                                 
                                    
                                    3.6%
                                 
                                                             | 
                                                        
                    |
| 8 | 292 | 
                                                                 
                                    
                                    2.7%
                                 
                                                             | 
                                                        
                    |
| 9 | 73 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 10 | 41 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 11 | 3 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 12 | 23 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 13 | 3 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 14 | 7 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 15 | 9 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 18 | 1 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 25 | 1 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 30 | 1 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 35 | 1 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 44 | 1 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 46 | 1 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 52 | 1 | 
                                                                 
                                    
                                    0%
                                 
                                                             |