Home Broadband Adoption 2006 study.

Adoption of high-speed internet at home grew twice as fast in the year prior to March 2006 than in the same time frame from 2004 to 2005. Middle-income Americans accounted for much of the increase, along with African Americans and new internet users coming online with broadband at home. At the end of March 2006, 42% of Americans had high-speed at home, up from 30% in March 2005, or a 40% increase. And 48 million Americans — mostly those with high-speed at home — have posted content to the internet.

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http://www.pewinternet.org/pdfs/PIP_Broadband_trends2006.pdf