Year	US Dollars
1990	11115088327.9734
1991	11123706625.2595
1992	11364169406.7153
1993	12717976051.0037
1994	12038857874.0774
1995	12660661830.313
1996	13785610387.5204
1997	14540669212.0989
1998	14569184253.0682
1999	15724536089.9226
2000	16793204436.0393
2001	18147229103.0324
2002	19344313377.5761
2003	21246966672.9611
2004	22526450596.9024
2005	24621020307.8027
2006	26915606791.2139
2007	29337561391.0166
2008	33389816034.1737
2009	38769023032.6892
2010	41506432857.03169
2011	45584354103.5952
2012	51851496278.99921
2013	53783573773.36289
2014	58637538932.17579
2015	61168335732.5435
2016	63916126785.7255
2017	67074517915.3706