| Value | Category | Cases | |
|---|---|---|---|
| -8 | other error | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| -7 | filter error | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| -3 | inapplicable | 15645 | 
                                                                 
                                    
                                    99.5%
                                 
                                                             | 
                                                        
                    
| -2 | no answer | 40 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    
| -1 | does not know | 37 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             |