| Value | Category | 
                                    
                    
                        | -9 | Don't Know | 
                                    
                    
                        | -8 | Refused | 
                                    
                    
                        | -5 | Not Applicable | 
                                    
                    
                        | -3 | Missing | 
                                    
                    
                        | 0 |  | 
                                    
                    
                        | 4 |  | 
                                    
                    
                        | 6 |  | 
                                    
                    
                        | 30 |  | 
                                    
                    
                        | 40 |  | 
                                    
                    
                        | 60 |  | 
                                    
                    
                        | 70 |  | 
                                    
                    
                        | 100 |  | 
                                    
                    
                        | 120 |  | 
                                    
                    
                        | 125 |  | 
                                    
                    
                        | 150 |  | 
                                    
                    
                        | 180 |  | 
                                    
                    
                        | 280 |  | 
                                    
                    
                        | 300 |  | 
                                    
                    
                        | 320 |  | 
                                    
                    
                        | 350 |  | 
                                    
                    
                        | 1350 |  | 
                                    
                    
                        | 1400 |  | 
                                    
                    
                        | 1600 |  | 
                                    
                    
                        | 6000 |  | 
                                    
                    
                        | 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.