| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 38 | 
                                                                 
                                    
                                    66.7%
                                 
                                                             | 
                                                        
                    
| 0 | 2 | 
                                                                 
                                    
                                    3.5%
                                 
                                                             | 
                                                        
                    |
| 5 | 1 | 
                                                                 
                                    
                                    1.8%
                                 
                                                             | 
                                                        
                    |
| 10 | 4 | 
                                                                 
                                    
                                    7%
                                 
                                                             | 
                                                        
                    |
| 15 | 2 | 
                                                                 
                                    
                                    3.5%
                                 
                                                             | 
                                                        
                    |
| 20 | 3 | 
                                                                 
                                    
                                    5.3%
                                 
                                                             | 
                                                        
                    |
| 40 | 1 | 
                                                                 
                                    
                                    1.8%
                                 
                                                             | 
                                                        
                    |
| 50 | 1 | 
                                                                 
                                    
                                    1.8%
                                 
                                                             | 
                                                        
                    |
| 100 | 5 | 
                                                                 
                                    
                                    8.8%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 2898 |