Year	US Dollars
1990	8938800139.77001
1991	6385281510.63739
1992	5927609833.88252
1993	6864795993.05548
1994	7687021223.07445
1995	9028200836.05795
1996	10063435475.8868
1997	9123322090.09911
1998	10325998889.8513
1999	11728114847.0433
2000	12811632389.5263
2001	14065584344.9061
2002	14862377847.26579
2003	15969882459.3732
2004	17111639146.9918
2005	18254799261.5056
2006	20424212267.7075
2007	22256276513.96239
2008	24373910573.7303
2009	25390798025.1325
2010	27793320160.9902
2011	29663229076.2407
2012	30302902932.7462
2013	31131241234.96399
2014	32827676355.2593
2015	33039219274.30329
2016	33784487568.2081
2017	34815320843.7715