| Value |
Category |
| 1 |
Gas |
| 2 |
Heating oil |
| 3 |
Electricity |
| 4 |
Coal, wood, etc |
| 5 |
Tele/district heating |
| 9 |
NIU (Not in universe) |
Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.