| Value | Category | Cases | |
|---|---|---|---|
| -8 | other error | 52 | 
                                                                 
                                    
                                    7.6%
                                 
                                                             | 
                                                        
                    
| -7 | filter error | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| -4 | no personal income | 5 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    
| -3 | inapplicable | 192 | 
                                                                 
                                    
                                    28.2%
                                 
                                                             | 
                                                        
                    
| -2 | no answer | 254 | 
                                                                 
                                    
                                    37.4%
                                 
                                                             | 
                                                        
                    
| -1 | does not know | 177 | 
                                                                 
                                    
                                    26%
                                 
                                                             |