*Units in thousands.
^rImplementation of new March CPS processing system.
¹Data from 1971 to 1979 weighted based on the 1970 decennial census.
²Data from 1980 to 1992 weighted based on the 1980 decennial census.
³Beginning in 1993 CPS data weighted based on the 1990 decennial census.
⁴Primary families only.
Source: Current Population Survey, Bureau of the Census
Note: The source of annual data is the Current Population Survey March Supplement. The quarterly data source is the monthly Current Population Survey/Housing Vacancy Survey.

^{*Units in thousands
1}Data from 1971 to 1979 weighted based on the 1970 decennial census.
²Data from 1980 to 1992 weighted based on the 1980 decennial census.
³Beginning in 1993 CPS data weighted based on the 1990 decennial census.
Source: Current Population Survey, Bureau of the Census
Note: The source of annual data is the Current Population Survey March Supplement. The quarterly data source is the monthly Current Population Survey/Housing Vacancy Survey.

*Components may not add to totals because of rounding. Units in thousands.
¹Census of Housing 1970.
²Census of Housing 1980.
³American Housing Survey estimates are available in odd-numbered years only after 1981.
⁴Census of Housing 1990.
⁵Annual Housing Survey estimates through 1981 based on 1970 Census weights; 1983 to 1989 estimates based on 1980 Census weights; 1991 and 1995 estimates based on 1990 Census weights. No reduction in Nation's housing inventory has ever occurred; apparent reductions are due to changes in bases used for weighting sample data.
Sources: Annual Data -- Annual or American Housing Surveys; Quarterly Data -- Current Population Series/Housing Vacancy Survey in Current Housing Reports: Housing Vacancies and Homeownership, Bureau of the Census, Department of Commerce

Source: Bureau of the Census, Department of Commerce