| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 13 | 
                                                                 
                                    
                                    18.8%
                                 
                                                             | 
                                                        
                    
| 1 | 17 | 
                                                                 
                                    
                                    24.6%
                                 
                                                             | 
                                                        
                    |
| 2 | 14 | 
                                                                 
                                    
                                    20.3%
                                 
                                                             | 
                                                        
                    |
| 3 | 12 | 
                                                                 
                                    
                                    17.4%
                                 
                                                             | 
                                                        
                    |
| 4 | 3 | 
                                                                 
                                    
                                    4.3%
                                 
                                                             | 
                                                        
                    |
| 5 | 6 | 
                                                                 
                                    
                                    8.7%
                                 
                                                             | 
                                                        
                    |
| 8 | 3 | 
                                                                 
                                    
                                    4.3%
                                 
                                                             | 
                                                        
                    |
| 20 | 1 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 81 |