| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 3 | 1 | 
                                    
                                    0.7%
                                 | |
| 20 | 1 | 
                                    
                                    0.7%
                                 | |
| 50 | 4 | 
                                    
                                    2.7%
                                 | |
| 60 | 4 | 
                                    
                                    2.7%
                                 | |
| 70 | 3 | 
                                    
                                    2%
                                 | |
| 80 | 6 | 
                                    
                                    4%
                                 | |
| 90 | 2 | 
                                    
                                    1.3%
                                 | |
| 98 | 1 | 
                                    
                                    0.7%
                                 | |
| 100 | 128 | 
                                    
                                    85.3%
                                 |