| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 1 | Very easy | 63 | 
                                                                 
                                    
                                    2.6%
                                 
                                                             | 
                                                        
                    
| 2 | Easy | 297 | 
                                                                 
                                    
                                    12.4%
                                 
                                                             | 
                                                        
                    
| 3 | Difficult | 1015 | 
                                                                 
                                    
                                    42.3%
                                 
                                                             | 
                                                        
                    
| 4 | Very difficult | 745 | 
                                                                 
                                    
                                    31%
                                 
                                                             | 
                                                        
                    
| 7 | Don't have to pay taxes | 93 | 
                                                                 
                                    
                                    3.9%
                                 
                                                             | 
                                                        
                    
| 9 | Don't know | 187 | 
                                                                 
                                    
                                    7.8%
                                 
                                                             | 
                                                        
                    
| 998 | Refused | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             |