Year	US Dollars
1990	3152739235.63013
1991	3338272526.7497
1992	3539440881.40405
1993	3632667093.52741
1994	3626761313.18862
1995	4112937472.12602
1996	4494247364.25669
1997	4704481071.81717
1998	4678995529.11971
1999	4987981613.15355
2000	5009542720.1048
2001	5414708510.04431
2002	5393866718.46916
2003	5593036609.89949
2004	6076701991.71209
2005	7014866114.75887
2006	7287421342.91789
2007	7872264091.55969
2008	7985267295.83505
2009	8012044657.11077
2010	8160908142.05332
2011	8915944430.94028
2012	9522446578.11766
2013	10447106433.2917
2014	10764106355.5913
2015	11005006413.9171
2016	11155979868.8253
2017	11653197692.02241