| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    
| 0 | 6 | 
                                                                 
                                    
                                    1.6%
                                 
                                                             | 
                                                        
                    |
| 2 | 2 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 10 | 4 | 
                                                                 
                                    
                                    1.1%
                                 
                                                             | 
                                                        
                    |
| 15 | 1 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 20 | 6 | 
                                                                 
                                    
                                    1.6%
                                 
                                                             | 
                                                        
                    |
| 25 | 2 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 30 | 13 | 
                                                                 
                                    
                                    3.6%
                                 
                                                             | 
                                                        
                    |
| 35 | 3 | 
                                                                 
                                    
                                    0.8%
                                 
                                                             | 
                                                        
                    |
| 40 | 34 | 
                                                                 
                                    
                                    9.3%
                                 
                                                             | 
                                                        
                    |
| 45 | 3 | 
                                                                 
                                    
                                    0.8%
                                 
                                                             | 
                                                        
                    |
| 50 | 48 | 
                                                                 
                                    
                                    13.2%
                                 
                                                             | 
                                                        
                    |
| 55 | 8 | 
                                                                 
                                    
                                    2.2%
                                 
                                                             | 
                                                        
                    |
| 60 | 67 | 
                                                                 
                                    
                                    18.4%
                                 
                                                             | 
                                                        
                    |
| 65 | 18 | 
                                                                 
                                    
                                    4.9%
                                 
                                                             | 
                                                        
                    |
| 67 | 1 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 70 | 45 | 
                                                                 
                                    
                                    12.4%
                                 
                                                             | 
                                                        
                    |
| 75 | 10 | 
                                                                 
                                    
                                    2.7%
                                 
                                                             | 
                                                        
                    |
| 80 | 22 | 
                                                                 
                                    
                                    6%
                                 
                                                             | 
                                                        
                    |
| 85 | 4 | 
                                                                 
                                    
                                    1.1%
                                 
                                                             | 
                                                        
                    |
| 88 | 1 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 90 | 5 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                                                        
                    |
| 98 | 1 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 100 | 58 | 
                                                                 
                                    
                                    15.9%
                                 
                                                             |