Year	US Dollars
1990	40163710948.2592
1991	43368767107.62959
1992	46589234337.07109
1993	51111280633.5466
1994	54777357864.08391
1995	58584667655.80191
1996	61855884308.08101
1997	67117165960.40151
1998	70728113845.4996
1999	74724094196.35672
2000	80913180960.08398
2001	81592817587.2791
2002	86365871980.55879
2003	93901238361.89502
2004	101650307905.90701
2005	111207024961.49901
2006	123225251797.93399
2007	135492435223.77
2008	144461300721.785
2009	152604504356.32895
2010	166961839151.04498
2011	184899504319.22
2012	203914666618.53793
2013	212971898225.13599
2014	227731624594.854
2015	241158892730.94498
2016	254654834838.54694
2017	267353029457.95694