| Value | 
                    Category | 
                                                                            
                                    
                    
                        | 200 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 250 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 269 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 280 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 320 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 330 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 350 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 380 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 420 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 530 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 670 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 720 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 1800 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 2709 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 3000 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 3500 | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | -9 | 
                        don't know  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | -7 | 
                        the firm was not in business three years ago  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 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.