| Value | 
                    Category | 
                                                                            
                                    
                    
                        | 10 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 18 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 20 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 30 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 35 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 50 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 60 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 75 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 100 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 120 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 150 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 180 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 200 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 240 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 250 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 300 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 320 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 360 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 400 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 450 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 500 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 600 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 800 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 900 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 999 | 
                        d/k  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 1000 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 1200 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 1500 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 1600 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 1800 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 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.