Year	US Dollars
1990	525913657725.11902
1991	557401487275.13599
1992	574822824109.63293
1993	584763900688.73303
1994	603456167738.73596
1995	641304961270.53394
1996	667432988499.23218
1997	709340536591.49597
1998	758448382928.85327
1999	799362833295.00415
2000	870200274096.28003
2001	926784100267.13782
2002	998189440558.68701
2003	1048437298561.60986
2004	1113776377722.58984
2005	1191810871361.95996
2006	1344468185039.07959
2007	1438363711992.58008
2008	1496522755014.04004
2009	1473932112731.71997
2010	1467462693143.35986
2011	1472969169435.77002
2012	1485648425269.36011
2013	1512101363366.91992
2014	1561678787485.34009
2015	1613691356767.67017
2016	1687230963980.67017
2017	1769480405918.13989