The number of country A forces in Country b decreased to approximately 34,000 in 2014 from a high of about 100,000 in 2009. The mount of country a funding for country b security forces also decrease during this period. The function f(x)=-1.323x^2+5.136x+5.517 can be used to estimate the amount of country A funding for country B security forces, in billion of dollars, x years after January 2008. In what year was the amount of country a funding for country b security forces about $10.5 billion?