The number of country A forces in country B decreased to approximately 34,000 in 2014 from a high of about 100,000 in 2010. The amount of country A funding for country B security forces also decreased during this period. The function f(x)--1.404x²+ 5.291x+ 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 2009. In what year was the amount of country A funding for country B security forces about $10.5 billion?
The amount of country A funding for country B security forces was about $10.5 billion in the year____.(Round down to the nearest year.)