| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1 | very difficult | 1041 | 1052 | 
                                    
                                    35%
                                 | 
| 2 | difficult | 1022 | 1004 | 
                                    
                                    33.4%
                                 | 
| 3 | simple | 634 | 648 | 
                                    
                                    21.6%
                                 | 
| 4 | very simple | 155 | 168 | 
                                    
                                    5.6%
                                 | 
| 9 | DK | 153 | 133 | 
                                    
                                    4.4%
                                 |