The U.S. Strategic Oil Reserve is a government-owned stockpile of crude oil. It was established after the oil embargo in the mid-1970s and is meant to serve as a national defense fuel reserve, as well as to offset reductions in commercial oil supplies that would threaten the U.S. economy.

(a) How many times larger should the graphic for 2009 be than the 1977 graphic (to the nearest whole number)?
(b) The United States imported approximately 10 million barrels of oil per day in 2009. At that rate, assuming no change in U.S. oil production, how long would the U.S. strategic oil reserve last if no oil were imported?

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U.S. Strategic Oil Reserves (millions of barrels) 726.6 7.5 1977 2009