Population and Housing Censuses  
National results
Dwellings according to type of dwelling and construction year (added) of the building
Units: dwellings

	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	No data recorded	
2.1 Total main dwellings	18,083,692	597,453	358,404	490,702	546,733	1,315,009	2,703,119	3,720,472	2,242,375	2,598,718	2,955,554	555,155	
2.21 Secondary dwellings	3,681,565	207,956	102,711	108,352	124,624	218,147	401,816	747,628	599,071	480,647	625,945	64,667	
2.22 Empty dwellings	3,443,365	236,471	129,586	155,761	159,485	300,949	468,263	543,252	295,750	316,828	767,925	69,095	
Notes:
Source: National Statistics Institute