| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    
| 0 | 1 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 20 | 2 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    |
| 25 | 1 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 30 | 4 | 
                                                                 
                                    
                                    1.9%
                                 
                                                             | 
                                                        
                    |
| 40 | 6 | 
                                                                 
                                    
                                    2.9%
                                 
                                                             | 
                                                        
                    |
| 50 | 12 | 
                                                                 
                                    
                                    5.7%
                                 
                                                             | 
                                                        
                    |
| 51 | 1 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 60 | 3 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                                                        
                    |
| 65 | 1 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 70 | 15 | 
                                                                 
                                    
                                    7.2%
                                 
                                                             | 
                                                        
                    |
| 75 | 2 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    |
| 80 | 18 | 
                                                                 
                                    
                                    8.6%
                                 
                                                             | 
                                                        
                    |
| 85 | 3 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                                                        
                    |
| 90 | 11 | 
                                                                 
                                    
                                    5.3%
                                 
                                                             | 
                                                        
                    |
| 95 | 3 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                                                        
                    |
| 100 | 124 | 
                                                                 
                                    
                                    59.3%
                                 
                                                             |