| Value | Category | Cases | |
|---|---|---|---|
| 1 | Electricity | 180 |
8.8%
|
| 2 | gas | 66 |
3.2%
|
| 3 | Paraffin | 1300 |
63.4%
|
| 4 | coal | 16 |
0.8%
|
| 5 | wood | 81 |
3.9%
|
| 6 | cow dung | 2 |
0.1%
|
| 7 | crop waste | 2 |
0.1%
|
| 8 | other | 30 |
1.5%
|
| 9 | None | 374 |
18.2%
|
| Sysmiss | 176 |