Year	US Dollars
1990	14567889444.569
1991	16006858355.4366
1992	17055440860.0065
1993	18101573068.2825
1994	20022409724.0695
1995	21112815932.54249
1996	22654665708.9949
1997	24201866020.86769
1998	25198306465.71729
1999	26739071718.4301
2000	29079468487.201
2001	31176311583.11629
2002	31529771618.0159
2003	33425265667.66249
2004	35889067716.4555
2005	38560047170.19309
2006	41278674565.207
2007	43937534760.826
2008	47512232870.01701
2009	50149506031.272
2010	52983710927.2424
2011	55810345453.66151
2012	59705495328.01081
2013	63153968754.256
2014	68743057602.2867
2015	71755458708.9959
2016	72903112527.64958
2017	79431550716.23828