Assume the annual rate of change in the national debt of a country (in billions of dollars per year) can be modeled by the funcfion D'(1) = 852.14 +820.481-150 21P 15.96 where t is the number of years since 1995. By how much did the debt increase between 1996 and 2007? The debt increased by $ billion (Round to two decimal places as needed.)

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