| Value | Category | Cases | |
|---|---|---|---|
| -1 | Don't know | 0 |
0%
|
| 0 | None | 8784 |
22%
|
| 1 | Electricity | 26331 |
65.9%
|
| 2 | Gas | 1537 |
3.8%
|
| 4 | Solar | 124 |
0.3%
|
| 5 | Paraffin | 1710 |
4.3%
|
| 6 | Coal or wood | 1027 |
2.6%
|
| 97 | Other | 419 |
1%
|
| Sysmiss | 2488 |