| Value | Category | Cases | |
|---|---|---|---|
| 0 | None | 34 |
2.2%
|
| 1 | Central heating | 7 |
0.5%
|
| 2 | Electricity | 440 |
28.7%
|
| 3 | Natural gas | 244 |
15.9%
|
| 4 | Liquefied gas | 4 |
0.3%
|
| 5 | Oil and diesel | 2 |
0.1%
|
| 6 | Wood | 381 |
24.9%
|
| 9 | Other | 421 |
27.5%
|
| Sysmiss | 3651 |