Year	US Dollars
1990	8517617729.76019
1991	9293428728.30194
1992	9700873747.35039
1993	10927982473.0253
1994	11873719465.2042
1995	13589806096.5533
1996	15131558849.2324
1997	16256003852.8068
1998	17261737917.4217
1999	18917646762.289
2000	19655003328.55289
2001	20853211364.9302
2002	23242169690.5526
2003	25264374010.28189
2004	27547985959.3473
2005	30160059218.309
2006	34599933963.2794
2007	38734957826.41479
2008	42980353339.22841
2009	46313815079.0122
2010	49528989659.40849
2011	55370715714.026
2012	58291428763.4864
2013	61283384999.31448
2014	65489649940.0154
2015	69930681817.36549
2016	73995228170.8609
2017	78005892174.3791