Year	US Dollars
1990	34470630951.2222
1991	36011050609.6114
1992	36638710177.7874
1993	36878242844.30111
1994	39146678048.45049
1995	42396351274.6516
1996	45735987365.13031
1997	47007592200.7081
1998	49275722337.0573
1999	50966875050.5649
2000	52608777930.14461
2001	55777031175.85181
2002	57064552896.22119
2003	59794639542.2935
2004	64728035729.1344
2005	71361399153.05589
2006	78127883407.21152
2007	85547400247.67757
2008	87746886650.20819
2009	91307406589.55681
2010	99942123606.84341
2011	108655317520.867
2012	115348408834.701
2013	123110790951.048
2014	131601254107.42601
2015	141126670839.789
2016	151474669577.46802
2017	161521607373.81195