Housing conditions and energy efficiency Households by burden of housing costs (mortgage or rent, heating, electricity, etc.) by size of the household. Unidades: Horizontal percentages. A heavy burden A reasonable burden No burden Not specified Total 36,2 58 5,6 0,3 1 member 33,2 58,2 8,3 0,4 2 members 31,5 62,5 5,8 0,2 3 members 39,1 56,7 4 0,3 4 members 42,2 54,3 3,4 0,2 5 members or more 46,2 49,2 4,2 0,4 Notas: Fuente: Instituto Nacional de Estadística