Year	US Dollars
1990	3469668078.45475
1991	3709204626.43303
1992	3852498699.73005
1993	4134310303.42906
1994	4085218905.76575
1995	4600640135.20184
1996	5319606476.48547
1997	5167709782.25203
1998	5405128250.04256
1999	5924092647.09288
2000	5971085849.17154
2001	6010847800.75797
2002	6566112791.34279
2003	7061621059.51029
2004	7664420320.65054
2005	8568948637.44251
2006	9948039589.01255
2007	10568620846.6235
2008	11029946009.5544
2009	11217709648.1403
2010	11544228034.8349
2011	12159384598.5168
2012	13014085090.0286
2013	14131475878.3337
2014	15235514004.8646
2015	15442675755.9799
2016	16162425742.9186
2017	17258870428.8579