Year	US Dollars
2000	12664763610.7735
2001	13632254828.1402
2002	15237944246.2133
2003	16937071907.9499
2004	18685948591.0731
2005	21499500921.8641
2006	24592350325.363
2007	27415794566.9705
2008	28710497105.7967
2009	26523382053.1961
2010	27238150336.4677
2011	30946637998.43629
2012	33031898254.1458
2013	35403618516.76029
2014	36514073146.1975
2015	36944627847.8008
2016	38373072257.19809
2017	40912926004.8577