| Value | Category | Cases | |
|---|---|---|---|
| 1 | Very difficult | 1531 | 
                                    
                                    60.9%
                                 | 
| 2 | Somewhat difficult | 726 | 
                                    
                                    28.9%
                                 | 
| 3 | Not difficult at all | 241 | 
                                    
                                    9.6%
                                 | 
| 4 | (DK) | 14 | 
                                    
                                    0.6%
                                 | 
| 5 | (ref) | 2 | 
                                    
                                    0.1%
                                 | 
| Sysmiss | 486 |