Year	US Dollars
2001	8733832539.14227
2002	6517631041.52484
2003	11870388019.0606
2004	15540639891.0824
2005	28208304969.3669
2006	39503335602.45059
2007	20556024506.467
2008	29093805309.7345
2009	14819060585.4322
2010	41054050374.40441
2011	97363648740.63986
2012	132985704560.92601
2013	139353846153.84598
2014	121666167460.85802
2015	94976174268.20969
2016	90183798502.3826
2017	106957113682.77798