| Value | Category | 
                                    
                    
                        | 996 | 996. Exceeds max measurement possible | 
                                    
                    
                        | 997 | 997. Respondent disabled | 
                                    
                    
                        | 998 | 998. Refused | 
                            
            Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.