| Value | Category | 
                                    
                    
                        | -9 | Don't know | 
                                    
                    
                        | -8 | Refused | 
                                    
                    
                        | -5 | Not applicable | 
                                    
                    
                        | -3 | Missing | 
                                    
                    
                        | 3 |  | 
                                    
                    
                        | 500 |  | 
                                    
                    
                        | 1500 |  | 
                                    
                    
                        | 1600 |  | 
                                    
                    
                        | 2500 |  | 
                                    
                    
                        | 2600 |  | 
                                    
                    
                        | 2615 |  | 
                                    
                    
                        | 3000 |  | 
                                    
                    
                        | 6000 |  | 
                                    
                    
                        | 7000 |  | 
                                    
                    
                        | 14000 |  | 
                                    
                    
                        | 26000 |  | 
                                    
                    
                        | 28000 |  | 
                                    
                    
                        | 36000 |  | 
                                    
                    
                        | 71000 |  | 
                                    
                    
                        | 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.