| Value | Category | Cases | |
|---|---|---|---|
| -8 | other error | 446 | 
                                                                 
                                    
                                    6.7%
                                 
                                                             | 
                                                        
                    
| -7 | filter error | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| -5 | irregular, difficult to say | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| -4 | no personal income | 597 | 
                                                                 
                                    
                                    9%
                                 
                                                             | 
                                                        
                    
| -3 | inapplicable | 5172 | 
                                                                 
                                    
                                    78%
                                 
                                                             | 
                                                        
                    
| -2 | no answer | 281 | 
                                                                 
                                    
                                    4.2%
                                 
                                                             | 
                                                        
                    
| -1 | does not know | 138 | 
                                                                 
                                    
                                    2.1%
                                 
                                                             |