Population and Housing Censuses  
National Results
Buildings for housing by year of construction (aggregate) by no. of dwellings
Units: buildings

	Total	Before 1900	From 1900 to 1920	From 1921 to 1940	From 1941 to 1950	From 1951 to 1960	From 1961 to 1970	From 1971 to 1980	From 1981 to 1990	From 1991 to 2001	From 2002 to 2011	
Total	9,730,999	793,401	366,416	431,216	481,269	863,630	1,052,009	1,495,132	1,360,191	1,417,202	1,470,533	
1	7,701,066	697,546	307,447	353,495	394,023	676,965	735,461	1,093,484	1,088,687	1,135,947	1,218,011	
2	651,034	45,136	25,879	35,329	38,859	68,120	91,475	119,740	98,937	85,021	42,538	
3	202,023	14,450	8,294	10,671	11,674	20,678	30,195	38,839	28,855	24,841	13,526	
4	140,755	8,657	5,068	6,216	7,261	14,569	19,937	24,462	18,916	20,433	15,236	
5 to 9	412,664	16,445	9,841	12,244	15,257	40,161	59,796	75,092	54,337	66,281	63,210	
10 to 19	398,959	9,044	7,503	9,283	10,399	31,472	70,821	80,616	44,153	59,203	76,465	
20 to 29	131,068	1,515	1,653	2,462	2,367	7,521	27,403	32,887	14,421	16,178	24,661	
30 to 39	47,853	386	441	905	892	2,524	8,924	14,771	5,979	4,980	8,051	
40 or over	45,577	222	290	611	537	1,620	7,997	15,241	5,906	4,318	8,835	
Notes:
Source: National statistics Institute