Year	current US$
1967	18731279.11089671
1968	22586941.105706524
1969	27645703.361577198
1970	31363689.686118178
1971	33568232.26322923
1972	38297016.99566743
1973	39143104.66341693
1974	36105969.21352618
1975	44444938.1088715
1976	48572477.575
1977	53329553.45
1978	68728295.05
1979	83693941.635
1980	106562207.5
1981	120803805
1982	130201345
1983	120464542.5
1984	121119210
1985	121108882.5
1986	129453766.65533301
1987	145676202.689258
1988	130948231.58494401
1989	160649534.084677
1990	153452776.72538
1991	140851590.159895
1992	137061040.606384
1993	168667785.787436
1994	192894806.443619
1995	227750160.886131
1996	242793223.678917
1997	261554709.97917998
1998	278067279.677319
1999	294812910.313787
2000	355934377.033456
2001	334312866.423475
2002	353455698.974863
2003	426190368.679417
2004	417523295.682579
2005	506613510.32773
2006	512130211.416925
2007	548754629.000445
2008	644170898.99774
2009	608684839.9886149
2010	650730282.00903
2011	500748876.30814
2012	521703132.495265
2013	727908831.865785
2014	670724909.5497
2015	695228625.2283449
2016	674124938.779455
2017	670924379.89335