Year	US Dollars
1990	2675916636.65929
1991	2709455960.52744
1992	2928111662.83127
1993	3060075936.072
1994	3236916560.81584
1995	3483958780.76959
1996	3743646723.48971
1997	3705926013.61707
1998	3734281529.73924
1999	4125868751.594
2000	4376026543.88669
2001	4439298740.6984
2002	4728748893.31687
2003	4834511060.27341
2004	5229011786.31238
2005	5512815711.89045
2006	5482891552.09806
2007	5678343445.68127
2008	5834393223.7851
2009	5920417457.48339
2010	6002460147.29883
2011	6297184005.93723
2012	6458781659.33575
2013	6997719977.1651
2014	7263168961.16634
2015	7728323624.96678
2016	7878395262.50573
2017	8234613683.52944