| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    
| 0 | 7 | 
                                                                 
                                    
                                    3.3%
                                 
                                                             | 
                                                        
                    |
| 1 | 9 | 
                                                                 
                                    
                                    4.3%
                                 
                                                             | 
                                                        
                    |
| 2 | 38 | 
                                                                 
                                    
                                    18.2%
                                 
                                                             | 
                                                        
                    |
| 3 | 28 | 
                                                                 
                                    
                                    13.4%
                                 
                                                             | 
                                                        
                    |
| 4 | 27 | 
                                                                 
                                    
                                    12.9%
                                 
                                                             | 
                                                        
                    |
| 5 | 38 | 
                                                                 
                                    
                                    18.2%
                                 
                                                             | 
                                                        
                    |
| 6 | 11 | 
                                                                 
                                    
                                    5.3%
                                 
                                                             | 
                                                        
                    |
| 7 | 11 | 
                                                                 
                                    
                                    5.3%
                                 
                                                             | 
                                                        
                    |
| 8 | 6 | 
                                                                 
                                    
                                    2.9%
                                 
                                                             | 
                                                        
                    |
| 10 | 12 | 
                                                                 
                                    
                                    5.7%
                                 
                                                             | 
                                                        
                    |
| 11 | 2 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    |
| 12 | 1 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 14 | 1 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 15 | 5 | 
                                                                 
                                    
                                    2.4%
                                 
                                                             | 
                                                        
                    |
| 20 | 2 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    |
| 25 | 1 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 30 | 2 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    |
| 35 | 1 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 50 | 1 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 54 | 1 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 55 | 1 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 60 | 2 | 
                                                                 
                                    
                                    1%
                                 
                                                             |