| Value | Category | 
                                    
                    
                        | 1470 |  | 
                                    
                    
                        | 1500 |  | 
                                    
                    
                        | 1800 |  | 
                                    
                    
                        | 2200 |  | 
                                    
                    
                        | 2240 |  | 
                                    
                    
                        | 2500 |  | 
                                    
                    
                        | 2600 |  | 
                                    
                    
                        | 3000 |  | 
                                    
                    
                        | 4500 |  | 
                                    
                    
                        | 5000 |  | 
                                    
                    
                        | 6000 |  | 
                                    
                    
                        | 6500 |  | 
                                    
                    
                        | 999998 | refusal | 
                                    
                    
                        | Sysmiss |  | 
                            
            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.