Year	US Dollars
1990	20151055752.3686
1991	19336628427.1711
1992	18050925715.7372
1993	20807745653.3773
1994	21915793349.1771
1995	23830016281.7797
1996	27356856038.5176
1997	28518578852.1928
1998	27909759657.6078
1999	29850107652.0728
2000	32367852815.3691
2001	35892246701.71279
2002	36972895787.5466
2003	36863952965.47289
2004	43079074812.2924
2005	49889815940.83551
2006	57015360784.1768
2007	65449782389.7217
2008	73934453947.65659
2009	80889823110.76158
2010	91938773642.5726
2011	104477152060.005
2012	115597742416.34402
2013	129892470770.08099
2014	145712442571.87698
2015	162385250476.54901
2016	177024389218.47803
2017	198104479326.41898