| Value | Category | 
                                    
                    
                        | -9 | Don't know (SPONTANEOUS) | 
                                    
                    
                        | -8 | REFUSAL (SPONTANEOUS) | 
                                    
                    
                        | 1 |  | 
                                    
                    
                        | 3 |  | 
                                    
                    
                        | 5 |  | 
                                    
                    
                        | 6 |  | 
                                    
                    
                        | 8 |  | 
                                    
                    
                        | 10 |  | 
                                    
                    
                        | 12 |  | 
                                    
                    
                        | 14 |  | 
                                    
                    
                        | 18 |  | 
                                    
                    
                        | 24 |  | 
                                    
                    
                        | 30 |  | 
                                    
                    
                        | 36 |  | 
                                    
                    
                        | 48 |  | 
                                    
                    
                        | 50 |  | 
                                    
                    
                        | 60 |  | 
                                    
                    
                        | 72 |  | 
                                    
                    
                        | 84 |  | 
                                    
                    
                        | 90 |  | 
                                    
                    
                        | 94 |  | 
                                    
                    
                        | 120 |  | 
                                    
                    
                        | 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.