Year	US Dollars
1990	4854449044.02384
1991	4791248504.85085
1992	4867851927.4859
1993	4922192355.97039
1994	5181477392.07035
1995	6526363043.65659
1996	7494604456.94208
1997	4804786957.58634
1998	5245008219.8487
1999	5644922239.29514
2000	5996169328.30496
2001	6280091283.63166
2002	6550935479.99992
2003	6633969273.71655
2004	6896425504.59388
2005	7266022403.21916
2006	7648324547.81632
2007	7961585202.0805
2008	8072176676.85503
2009	7721340486.22429
2010	7853899192.31634
2011	8074171135.43638
2012	11022637191.4415
2013	11165489632.8526
2014	11198086531.5633
2015	11471609123.807
2016	11342593120.372
2017	11778573892.9034