| Value | Category | Cases | |
|---|---|---|---|
| 1 | Electricity | 7 | 
                                    
                                    0.2%
                                 | 
| 2 | Gas | 2811 | 
                                    
                                    98.6%
                                 | 
| 3 | Kerosene | 13 | 
                                    
                                    0.5%
                                 | 
| 4 | Coal\firewood | 17 | 
                                    
                                    0.6%
                                 | 
| 5 | Other | 3 | 
                                    
                                    0.1%
                                 |