| Value | Category | Cases | |
|---|---|---|---|
| -8 | other error | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| -7 | filter error | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| -5 | irregular | 31 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    
| -3 | inapplicable | 14831 | 
                                                                 
                                    
                                    99.7%
                                 
                                                             | 
                                                        
                    
| -2 | no answer | 2 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| -1 | does not know | 7 | 
                                                                 
                                    
                                    0%
                                 
                                                             |