Year	US Dollars
1990	4613063579.60822
1991	4990029975.5706
1992	5147284664.37368
1993	5682238348.14608
1994	5893460054.2383
1995	6390432898.79992
1996	6794760899.42933
1997	7354666938.85323
1998	7789212024.75325
1999	8338095098.45204
2000	9025859973.53171
2001	9717145166.20424
2002	10285377482.0237
2003	10845835532.8368
2004	11656166041.9788
2005	12292499568.1422
2006	13141453667.418
2007	14266589220.1276
2008	15358235744.1237
2009	15786736831.9577
2010	16267176092.2592
2011	17192949487.50541
2012	18238941538.6225
2013	19879059522.7251
2014	21547946865.64749
2015	22306140124.7148
2016	23572042407.1651
2017	25291445584.2144