| Value | Category | 
                                    
                    
                        | -9 | Don't know (spontaneous) | 
                                    
                    
                        | 0 | None (spontaneous) | 
                                    
                    
                        | 700000 |  | 
                                    
                    
                        | 1000000 |  | 
                                    
                    
                        | 4000000 |  | 
                                    
                    
                        | 5000000 |  | 
                                    
                    
                        | 20000000 |  | 
                                    
                    
                        | 35000000 |  | 
                                    
                    
                        | 120000000 |  | 
                                    
                    
                        | 200000000 |  | 
                                    
                    
                        | 250000000 |  | 
                                    
                    
                        | 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.