| Value | Category | 
                                    
                    
                        | 1 | private - registered | 
                                    
                    
                        | 2 | private - unregistered | 
                                    
                    
                        | 3 | state | 
                                    
                    
                        | 4 | public | 
                                    
                    
                        | 5 | other | 
                                    
                    
                        | 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.