| Value | Category | 
                                    
                    
                        | 200 |  | 
                                    
                    
                        | 280 |  | 
                                    
                    
                        | 320 |  | 
                                    
                    
                        | 360 |  | 
                                    
                    
                        | 480 |  | 
                                    
                    
                        | 560 |  | 
                                    
                    
                        | 600 |  | 
                                    
                    
                        | 720 |  | 
                                    
                    
                        | 864 |  | 
                                    
                    
                        | 880 |  | 
                                    
                    
                        | 1000 |  | 
                                    
                    
                        | 1008 |  | 
                                    
                    
                        | 1040 |  | 
                                    
                    
                        | 1120 |  | 
                                    
                    
                        | 1320 |  | 
                                    
                    
                        | 1360 |  | 
                                    
                    
                        | 1400 |  | 
                                    
                    
                        | 1600 |  | 
                                    
                    
                        | 2240 |  | 
                                    
                    
                        | 9999998 | 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.