| Value | Category | 
                                    
                    
                        | 0 | ANSWER | 
                                    
                    
                        | 1 | Can't estimate | 
                                    
                    
                        | 2 | Don't know | 
                                    
                    
                        | 3 | Didn'r receive anything | 
                                    
                    
                        | 999998 | REFUSAL | 
                                    
                    
                        | 999999 | DONTKNOW | 
                            
            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.