| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 7 | 
                                                                 
                                    
                                    1.8%
                                 
                                                             | 
                                                        
                    
| 0 | 161 | 
                                                                 
                                    
                                    41.5%
                                 
                                                             | 
                                                        
                    |
| 4 | 1 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 5 | 3 | 
                                                                 
                                    
                                    0.8%
                                 
                                                             | 
                                                        
                    |
| 8 | 1 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 10 | 18 | 
                                                                 
                                    
                                    4.6%
                                 
                                                             | 
                                                        
                    |
| 11 | 1 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 12 | 1 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 15 | 12 | 
                                                                 
                                    
                                    3.1%
                                 
                                                             | 
                                                        
                    |
| 20 | 30 | 
                                                                 
                                    
                                    7.7%
                                 
                                                             | 
                                                        
                    |
| 25 | 129 | 
                                                                 
                                    
                                    33.2%
                                 
                                                             | 
                                                        
                    |
| 30 | 14 | 
                                                                 
                                    
                                    3.6%
                                 
                                                             | 
                                                        
                    |
| 35 | 1 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 40 | 5 | 
                                                                 
                                    
                                    1.3%
                                 
                                                             | 
                                                        
                    |
| 50 | 3 | 
                                                                 
                                    
                                    0.8%
                                 
                                                             | 
                                                        
                    |
| 60 | 1 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             |