| Value | Category | Cases | |
|---|---|---|---|
| 0 | None | 109 |
8.2%
|
| 1 | Central heating | 1 |
0.1%
|
| 2 | Electricity | 442 |
33.4%
|
| 3 | Natural gas | 138 |
10.4%
|
| 4 | Liquefied gas | 4 |
0.3%
|
| 5 | Oil and diesel | 6 |
0.5%
|
| 6 | Wood | 218 |
16.5%
|
| 9 | Other | 406 |
30.7%
|
| Sysmiss | 3860 |