Year	US Dollars
1990	17802885689.7865
1991	19379763906.6449
1992	20630081117.5762
1993	22094246247.4386
1994	23271824638.7344
1995	24729155076.238
1996	26336064790.11909
1997	27948066155.0677
1998	29552713568.5919
1999	31295265795.7507
2000	32911554499.1007
2001	35338354181.81861
2002	37470379736.53841
2003	40179278277.2459
2004	43564842361.3222
2005	48111992769.72921
2006	53081501857.44671
2007	56897092564.53632
2008	63422800636.414
2009	67030437743.15781
2010	72256006644.7482
2011	82867099335.88277
2012	90361101597.47981
2013	100872296690.158
2014	104994870322.216
2015	113321335890.17001
2016	118187286310.73798
2017	129397184544.47803