Year	US Dollars
1990	5299424260.61897
1991	6032381233.63903
1992	6439083945.7617
1993	6568993875.85432
1994	6802667363.37711
1995	7398149842.12486
1996	7612767481.84292
1997	8053264034.15522
1998	8464005518.47778
1999	8644922493.87663
2000	9270278219.03271
2001	9509372110.48245
2002	10222659438.8157
2003	11259929685.9458
2004	12569563922.5026
2005	12932903424.0767
2006	14403401409.5615
2007	15573498375.4608
2008	16337173145.8493
2009	16467447095.1947
2010	17323826274.5548
2011	18802155661.26049
2012	19847157840.6741
2013	22038610890.5368
2014	23971552379.9966
2015	25647656410.0207
2016	25683208950.274
2017	26156085285.4724