<P> The 2000 U.S. Census counted same - sex couples in an oblique way; asking the sex and the relationship to the "main householder", whose sex was also asked . One organization specializing in analyzing gay demographic data reported, based on this count in the 2000 census and in the 2000 supplementary survey, that same - sex couples comprised between 0.99% and 1.13% of U.S. couples in 2000 . A 2006 report issued by The Williams Institute on Sexual Orientation concluded that the number of same - sex couples in the U.S. grew from 2000 to 2005, from nearly 600,000 couples in 2000 to almost 777,000 in 2005 . A 2006 UCLA study reported that 4.1% of Americans aged 18--45 identify as gay, lesbian, or bisexual . </P> <P> A 2011 report by the Institute estimated that 4 million adults identify as gay or lesbian, representing 1.7% of the population over 18 . A spokesperson said that, until recently, few studies have tried to eliminate people who had occasionally undertaken homosexual behavior or entertained homosexual thoughts, from people who identified as lesbian or gay . (Older estimates have varied depending on methodology and timing; see Demographics of sexual orientation for a list of studies .) The American Community Survey from the 2000 U.S. Census estimated 776,943 same - sex couple households in the country as a whole, representing about 0.5% of the population . </P> <Table> U.S. Census Population projections (2012) <Tr> <Th> </Th> <Th> 2015 </Th> <Th> 2050 </Th> </Tr> <Tr> <Td> White Americans </Td> <Td> 77.4% </Td> <Td> 70.8% </Td> </Tr> <Tr> <Td>> Non-Hispanic Whites </Td> <Td> 61.8% </Td> <Td> 46.6% </Td> </Tr> <Tr> <Td> Black Americans </Td> <Td> 13.2% </Td> <Td> 14.4% </Td> </Tr> <Tr> <Td> Asian Americans </Td> <Td> 5.3% </Td> <Td> 7.7% </Td> </Tr> <Tr> <Td> Multiracial Americans </Td> <Td> 2.6% </Td> <Td> 5.4% </Td> </Tr> <Tr> <Td> Hispanics / Latinos (of any race) </Td> <Td> 17.8% </Td> <Td> 28.0% </Td> </Tr> <Tr> <Td_colspan="3"> Including Hispanics </Td> </Tr> </Table> <Tr> <Th> </Th> <Th> 2015 </Th> <Th> 2050 </Th> </Tr>

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