Determine the equation of the trend line for the data shown below on U.S. exports of fertilizers to Indonesia over a five-year period provided by the U.S Census Bureau. Using the trend line equation, forecast the value for the year 2013.
Year Fertilizer ($ millions)
2007 11.9
2008 17.9
2009 22.0
2010 21.8
2011 26.0.