Year	US Dollars
1990	8699164232.46495
1991	9215856374.64851
1992	9667783477.54979
1993	9907936222.48726
1994	10085610974.0034
1995	10903476546.8077
1996	11528858981.5684
1997	12079872843.0593
1998	12987875948.6814
1999	13927185644.5853
2000	14678095482.0479
2001	15754818736.015
2002	16050494713.7594
2003	17559905537.1361
2004	19150228310.281
2005	20897642315.6958
2006	22148106380.6886
2007	23866069647.1526
2008	25305651904.5172
2009	25861298335.32539
2010	27317664297.5164
2011	28143660936.7696
2012	29877166275.8776
2013	31391315499.6907
2014	33156610283.8597
2015	35533619400.607
2016	38206392114.1493
2017	41496554696.4174