Year	US Dollars
1990	325900252951.09607
1991	339554196379.59399
1992	368515387251.54211
1993	408139983270.59808
1994	390174273300.9209
1995	429608343205.27997
1996	468652534502.77289
1997	512269770926.224
1998	551360326099.59802
1999	537923336472.14502
2000	597099061199.56299
2001	577250259194.84399
2002	596184973556.06995
2003	623360450710.18384
2004	717915419039.09998
2005	798582176975.73291
2006	926544099362.66394
2007	1023467733843.34021
2008	1119242568184.92017
2009	1091441905914.7406
2010	1250939840476.27002
2011	1430728379922.50024
2012	1527509825406.71997
2013	1675523371335.3501
2014	1834700892255.70898
2015	1922818326171.12012
2016	1986127492435.04004
2017	2112247403802.73926