The number of country A forces in country B decreased to approximately 34,000 in 2014 from a high of about 100,000 in 2006. The amount of country A funding for country B security forces also decreased during this period. The function f(x)= -1.380x2+5.245x+5.517 can be used to estimate the amount of country A funding for country B security forces, in billions of dollars, x years after January 2005. In what year was the amount of country A funding for country B security forces about $10.5 billion?
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