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) = 856.82 + 822.2t- 191 55t- + 10.72+3 where t is the number of years since 1995. By how much did the debt increase between 1996 and 2006? The debt increased by S billion. (Round to two decimal places as needed.)