| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 11 | 
                                    
                                    9.9%
                                 | 
| 0 | 2 | 
                                    
                                    1.8%
                                 | |
| 20 | 2 | 
                                    
                                    1.8%
                                 | |
| 40 | 1 | 
                                    
                                    0.9%
                                 | |
| 50 | 2 | 
                                    
                                    1.8%
                                 | |
| 80 | 6 | 
                                    
                                    5.4%
                                 | |
| 90 | 2 | 
                                    
                                    1.8%
                                 | |
| 99 | 1 | 
                                    
                                    0.9%
                                 | |
| 100 | 84 | 
                                    
                                    75.7%
                                 |