| Value | Category | Cases | |
|---|---|---|---|
| -1 | Don't know | 0 |
0%
|
| 0 | None | 3991 |
10%
|
| 1 | Electricity | 16272 |
40.7%
|
| 2 | Gas | 16325 |
40.9%
|
| 4 | Solar | 26 |
0.1%
|
| 5 | Paraffin | 302 |
0.8%
|
| 6 | Coal or wood | 2992 |
7.5%
|
| 97 | Other | 53 |
0.1%
|
| Sysmiss | 2459 |