Housing conditions and energy efficiency Households by burden of housing costs (mortgage or rent, heating, electricity, etc.) by nationality of the reference person. Unidades: Horizontal percentages. ;A heavy burden;A reasonable burden;No burden;Not specified; Total;36,2;58;5,6;0,3; Spanish;35,8;58,5;5,5;0,3; Foreign (European Union);35,9;56,2;7,6;0,2; Foreign (rest of the world);42,8;50,3;6,6;0,4; Not specified;51,5;48,5;..;..; Notas: Fuente: Instituto Nacional de Estadística