Year	US Dollars
1990	39971726910.748
1991	44265390703.0687
1992	48293587394.1412
1993	52481589602.3145
1994	55586031025.8758
1995	59810977050.9473
1996	62558183477.1327
1997	67323707528.8944
1998	69137888650.28139
1999	70149070394.19719
2000	75984849231.2243
2001	81387011119.06319
2002	80347041812.35651
2003	81734713696.21912
2004	85930448726.84038
2005	89125666192.16629
2006	89901217218.9386
2007	105430466128.37801
2008	113710790455.405
2009	119659939825.21901
2010	126845746005.31398
2011	128052701201.13202
2012	142995407390.79095
2013	154428220745.63596
2014	159312029905.55801
2015	174730823147.99002
2016	184751376284.957
2017	186549508645.56802