| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 8 | 
                                                                 
                                    
                                    29.6%
                                 
                                                             | 
                                                        
                    
| 0 | 5 | 
                                                                 
                                    
                                    18.5%
                                 
                                                             | 
                                                        
                    |
| 8 | 1 | 
                                                                 
                                    
                                    3.7%
                                 
                                                             | 
                                                        
                    |
| 20 | 3 | 
                                                                 
                                    
                                    11.1%
                                 
                                                             | 
                                                        
                    |
| 25 | 2 | 
                                                                 
                                    
                                    7.4%
                                 
                                                             | 
                                                        
                    |
| 50 | 1 | 
                                                                 
                                    
                                    3.7%
                                 
                                                             | 
                                                        
                    |
| 100 | 2 | 
                                                                 
                                    
                                    7.4%
                                 
                                                             | 
                                                        
                    |
| 150 | 3 | 
                                                                 
                                    
                                    11.1%
                                 
                                                             | 
                                                        
                    |
| 172 | 1 | 
                                                                 
                                    
                                    3.7%
                                 
                                                             | 
                                                        
                    |
| 200 | 1 | 
                                                                 
                                    
                                    3.7%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 123 |