Year	US Dollars
1990	285372730249.35101
1991	294911789618.27698
1992	305734657414.96808
1993	328609154661.29504
1994	350236974117.50201
1995	364492216513.22107
1996	387906491748.39795
1997	410201743073.60999
1998	438079055803.96094
1999	462939974555.68805
2000	489486706602.53699
2001	516000750300.0069
2002	548780761547.03699
2003	573813339508.69006
2004	612215921578.96985
2005	638945630659.5719
2006	682092094946.18286
2007	726502932140.29407
2008	762372107394.29395
2009	842099458856.59387
2010	831622060334.94507
2011	898284771139.5769
2012	942264701012.58704
2013	1033546561004.14001
2014	1069850442929.34009
2015	1079646643445.88977
2016	1092062650073.60999
2017	1160066249864.98022