| Value | Category | 
                                    
                    
                        | 0 |  | 
                                    
                    
                        | 1 | Trader | 
                                    
                    
                        | 2 | Relatives & friends | 
                                    
                    
                        | 3 | Doctors, lawyers & other professionals | 
                                    
                    
                        | 4 |  | 
                                    
                    
                        | 5 |  | 
                                    
                    
                        | 7 |  | 
                                    
                    
                        | 8 |  | 
                                    
                    
                        | 9 | Others | 
                                    
                    
                        | 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.