| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 7 | 
                                                                 
                                    
                                    1.8%
                                 
                                                             | 
                                                        
                    
| 0 | 248 | 
                                                                 
                                    
                                    63.9%
                                 
                                                             | 
                                                        
                    |
| 10 | 5 | 
                                                                 
                                    
                                    1.3%
                                 
                                                             | 
                                                        
                    |
| 20 | 8 | 
                                                                 
                                    
                                    2.1%
                                 
                                                             | 
                                                        
                    |
| 25 | 120 | 
                                                                 
                                    
                                    30.9%
                                 
                                                             |