Assume the annual rate of change in the national debt of a country​ (in billions of dollars per​ year) can be modeled by the function D'(t)=847.89 + 824.78t -195.69t^2+14.76t^3   where t is the number of years since 1995. By how much did the debit increase between 1996 and 1999?   The debt increased by $____ billion. (Round to two decimal places as needed.)

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