| Value | Category | Cases | |
|---|---|---|---|
| 0 | None | 2418 |
75.1%
|
| 1 | Gas | 318 |
9.9%
|
| 2 | Electricity | 256 |
8%
|
| 3 | Wood | 211 |
6.6%
|
| 4 | Olive pulp | 3 |
0.1%
|
| 5 | Coal | 0 |
0%
|
| 6 | Other, specify | 10 |
0.3%
|
| Sysmiss | 4 |