| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 49 | 
                                    
                                    44.1%
                                 | 
| 0 | 23 | 
                                    
                                    20.7%
                                 | |
| 5 | 3 | 
                                    
                                    2.7%
                                 | |
| 10 | 3 | 
                                    
                                    2.7%
                                 | |
| 15 | 1 | 
                                    
                                    0.9%
                                 | |
| 20 | 5 | 
                                    
                                    4.5%
                                 | |
| 30 | 2 | 
                                    
                                    1.8%
                                 | |
| 40 | 4 | 
                                    
                                    3.6%
                                 | |
| 50 | 1 | 
                                    
                                    0.9%
                                 | |
| 60 | 4 | 
                                    
                                    3.6%
                                 | |
| 65 | 1 | 
                                    
                                    0.9%
                                 | |
| 70 | 3 | 
                                    
                                    2.7%
                                 | |
| 75 | 1 | 
                                    
                                    0.9%
                                 | |
| 80 | 6 | 
                                    
                                    5.4%
                                 | |
| 90 | 1 | 
                                    
                                    0.9%
                                 | |
| 95 | 1 | 
                                    
                                    0.9%
                                 | |
| 100 | 3 | 
                                    
                                    2.7%
                                 |