| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 13 | 
                                    
                                    11.7%
                                 | 
| 0 | 21 | 
                                    
                                    18.9%
                                 | |
| 5 | 3 | 
                                    
                                    2.7%
                                 | |
| 10 | 4 | 
                                    
                                    3.6%
                                 | |
| 15 | 2 | 
                                    
                                    1.8%
                                 | |
| 20 | 4 | 
                                    
                                    3.6%
                                 | |
| 30 | 1 | 
                                    
                                    0.9%
                                 | |
| 50 | 1 | 
                                    
                                    0.9%
                                 | |
| 60 | 4 | 
                                    
                                    3.6%
                                 | |
| 80 | 11 | 
                                    
                                    9.9%
                                 | |
| 90 | 4 | 
                                    
                                    3.6%
                                 | |
| 95 | 1 | 
                                    
                                    0.9%
                                 | |
| 98 | 1 | 
                                    
                                    0.9%
                                 | |
| 99 | 1 | 
                                    
                                    0.9%
                                 | |
| 100 | 40 | 
                                    
                                    36%
                                 |