The graph below shows recent values (in billions of dollars per year) of the U.S. deficit, which gives the rate that the U.S. debt accumulates. Use rectangles of width 2 years and height determined by the function value at the midpoint to estimate the total amount of debt accumulated from mid-2009 to mid-2019.

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Deficit (billions of dollars per year) 1600 1400 1200 1000 800 600 400 200 0- 1410 2009 1290 1300 2011 1080 680 480 440 2013 2015 Year 580 670 780 980 2017 2019