The total amount spent by some number of people on clothing and footwear in the years 2000-2009 can be modeled by the quadratic function f(x)-4.181x^2+72.74x+97.16, where x=0 represents January 1, 2000, x=1 represents January 1, 2001 and so on. and​ f(x) is in billions of dollars. According to the​ model, in what year during this period was the amount spent on clothing and footwear a​

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