| Forecast reporting year | Fifth forecast year | ||
| Energy index smaller or equal to zero point six | |||
| Energy index higher than zero point six and smaller or equal to zero point eight | |||
| Energy index higher than zero point eight and smaller or equal to one point two | |||
| Energy index higher than one point two and smaller or equal to one point four | |||
| Energy index higher than one point four and smaller or equal to one point eight | |||
| Energy index higher than one point eight and smaller or equal to two point one | |||
| Energy index higher than two point one and smaller or equal to two point four | |||
| Energy index higher than two point four and smaller or equal to two point seven | |||
| Energy index higher than two point seven | |||
| Energy index unknown | |||
| Number of independent units living space | |||