Year	US Dollars adjusted for inflation)
1990	31610993224.6745
1991	31231662693.7653
1992	28233422682.3594
1993	26087682006.1187
1994	23035422168.0158
1995	20639738139.7908
1996	21217651777.4411
1997	23636465240.0702
1998	25621926331.6632
1999	26493071605.9872
2000	28029670685.9076
2001	29354158398.36441
2002	30835154158.4007
2003	33006933477.4592
2004	36786142508.71619
2005	40244040518.2926
2006	44268442421.9721
2007	48075531367.195
2008	52979235376.38419
2009	53085191324.5955
2010	57222490768.7143
2011	60394740109.9615
2012	61440410270.0481
2013	62069551139.8208
2014	63139062692.4886
2015	60721108489.72861
2016	59187019676.14002
2017	60620473815.13502