Year	US Dollars
1990	7766872221.21641
1991	8088497917.40192
1992	9013029270.48619
1993	9309569569.85044
1994	10037565225.8443
1995	10727039239.7487
1996	11050231138.4091
1997	11619859738.8744
1998	13571452609.4311
1999	13199880657.3271
2000	14264206867.2982
2001	15510468546.082
2002	16419112636.36
2003	16989335804.4985
2004	18402267961.9721
2005	20123799612.2055
2006	22033659603.8023
2007	24907672602.3809
2008	26830745287.5201
2009	27019202873.48189
2010	26757384120.5334
2011	28242314745.3694
2012	26724846886.55849
2013	25160254271.3428
2014	24954517638.5957
2015	26892224919.5162
2016	27566352908.4321
2017	28838790395.952