With computer security always a hot-button issue, demand is growing for technology that authenticates and authorizes computer users. The following table gives the authentication software sales (in billions of dollars) , including projections, from 1999 through 2004. 
(Here, x = 0 represents 1999.) Find an equation of the least-squares line for these data. Please round the coefficients in your equation to three decimal places. Use the result to estimate the sales for 2005, assuming the projection is accurate.
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