Housing conditions and energy efficiency Households by burden of housing costs (mortgage or rent, heating, electricity, etc.) by size of municipality. Unidades: Horizontal percentages. A heavy burden A reasonable burden No burden Not specified Total 36,2 58 5,6 0,3 Fewer than 10,000 inhabitants 35 58,3 6,5 0,3 Between 10,000 and 50,000 inhabitants 38,7 56 4,9 0,4 Between 50,000 and 100,000 inhabitants 35,5 58,4 5,8 0,3 Between 100,000 and 500,000 inhabitants 35,9 57,8 6,1 0,2 More than 500,000 inhabitants 34,6 60,4 4,9 0,1 Notas: Fuente: Instituto Nacional de Estadística