| Value | Category | 
                                    
                    
                        | -9 | Don't Know | 
                                    
                    
                        | -8 | Refused | 
                                    
                    
                        | -5 | Not Applicable | 
                                    
                    
                        | -3 | Missing | 
                                    
                    
                        | 0 |  | 
                                    
                    
                        | 3 |  | 
                                    
                    
                        | 7 |  | 
                                    
                    
                        | 10 |  | 
                                    
                    
                        | 15 |  | 
                                    
                    
                        | 20 |  | 
                                    
                    
                        | 33 |  | 
                                    
                    
                        | 35 |  | 
                                    
                    
                        | 38 |  | 
                                    
                    
                        | 40 |  | 
                                    
                    
                        | 49 |  | 
                                    
                    
                        | 50 |  | 
                                    
                    
                        | 55 |  | 
                                    
                    
                        | 90 |  | 
                                    
                    
                        | 100 |  | 
                                    
                    
                        | 150 |  | 
                                    
                    
                        | 170 |  | 
                                    
                    
                        | 200 |  | 
                                    
                    
                        | 250 |  | 
                                    
                    
                        | 300 |  | 
                                    
                    
                        | 350 |  | 
                                    
                    
                        | 5700 |  | 
                                    
                    
                        | 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.