| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 | 
                                                                 
                                    
                                    1.8%
                                 
                                                             | 
                                                        
                    
| 1 | Very much difficult | 12 | 
                                                                 
                                    
                                    21.1%
                                 
                                                             | 
                                                        
                    
| 2 | Moderately difficult | 20 | 
                                                                 
                                    
                                    35.1%
                                 
                                                             | 
                                                        
                    
| 3 | Somewhat difficult | 14 | 
                                                                 
                                    
                                    24.6%
                                 
                                                             | 
                                                        
                    
| 4 | Not difficult at all | 10 | 
                                                                 
                                    
                                    17.5%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 95 |