Year	US Dollars
1990	170281195156.327
1991	172773835284.25696
1992	172485431421.56302
1993	171938111979.88098
1994	185555634821.28107
1995	197933093643.41891
1996	205671486374.974
1997	213593606890.16095
1998	224049655248.09897
1999	239959810442.83701
2000	259773343562.72397
2001	263929240353.33801
2002	273589376283.70697
2003	287203754640.99603
2004	303746878712.24994
2005	311346485382.388
2006	349273076943.742
2007	383033144677.63
2008	399934343214.58099
2009	378194393080.30798
2010	401826462748.40704
2011	422589806787.44
2012	436285524926.83807
2013	448494774346.71094
2014	460741909339.96497
2015	475339149961.23712
2016	490818519844.6579
2017	513294383130.81995