| Value | Category | 
                                    
                    
                        | -9 | do not know | 
                                    
                    
                        | 1 | cash | 
                                    
                    
                        | 2 | check or bank transfer | 
                                    
                    
                        | 3 | another form of payment | 
                                    
                    
                        | 4 | no payment for electricity | 
                                    
                    
                        | 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.