| Value | Category | 
                                    
                    
                        | 1 | Collected firewood | 
                                    
                    
                        | 2 | Puchased firewood | 
                                    
                    
                        | 3 | Grass | 
                                    
                    
                        | 4 | Parrafin | 
                                    
                    
                        | 5 | Electricity | 
                                    
                    
                        | 6 | Gas | 
                                    
                    
                        | 7 | Battery/dry cell | 
                                    
                    
                        | 8 | Candles | 
                                    
                    
                        | 9 | Other (specify) | 
                            
            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.