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