Year	US Dollars
1990	59973975770.4539
1991	66392303848.7337
1992	75267509079.0379
1993	82937987590.5939
1994	93417429660.63522
1995	106004715067.40302
1996	117439162998.83701
1997	128855823018.002
1998	137750096626.46002
1999	147295048007.57999
2000	173614230705.97302
2001	188836986787.66003
2002	203818351792.06897
2003	221796262337.173
2004	246251056787.34296
2005	250964084627.74109
2006	275842375657.82599
2007	301340539325.6311
2008	324076200886.20197
2009	339437939766.31604
2010	367547553283.75897
2011	396482343535.12604
2012	426297866621.21094
2013	455367257309.84393
2014	488892691089.13104
2015	525076661372.15698
2016	571116740300.34619
2017	616618427869.07703