| Value | Category | 
                                    
                    
                        | 0 |  | 
                                    
                    
                        | 1 | Weekly | 
                                    
                    
                        | 2 | Monthly | 
                                    
                    
                        | 3 | Yearly | 
                                    
                    
                        | 800 |  | 
                                    
                    
                        | 1700 |  | 
                                    
                    
                        | 2500 |  | 
                                    
                    
                        | 3250 |  | 
                                    
                    
                        | 8000 |  | 
                                    
                    
                        | 15000 |  | 
                                    
                    
                        | 15500 |  | 
                                    
                    
                        | 18000 |  | 
                                    
                    
                        | 25000 |  | 
                                    
                    
                        | 30000 |  | 
                                    
                    
                        | 32000 |  | 
                                    
                    
                        | 40000 |  | 
                                    
                    
                        | 50000 |  | 
                                    
                    
                        | 58000 |  | 
                                    
                    
                        | 60000 |  | 
                                    
                    
                        | 70000 |  | 
                                    
                    
                        | 160000 |  | 
                                    
                    
                        | 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.