by David Rachovich, retrieved from Aaron and David Rachovich, "U.S. Crude Oil Production, 1970-2010 -- EIA"
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(United States crude oil output reached its all-time peak of 9.637 million barrels per day in 1970 and began to fall rapidly and steadily after 1985. Following declines in all but one year, 1991, from 1986 to 2008, U.S. crude oil output increased in 2009 and again in 2010. -- D.R.)