Year	current US$
1964	36100000
1966	38800000
1967	51700000
1968	41800000
1969	52766000
1970	59150000
1971	72075000
1972	81251000
1973	99349000
1974	119204000
1975	136833000
1976	166140000
1977	204692000
1978	181255000
1979	232739000
1980	294876000
1981	277475000.5
1982	235227001
1983	229260000.8
1984	307570001
1985	227482000
1986	222408000
1987	311374883.5
1988	302993693.59999996
1989	275847919.40000004
1990	418651973.7
1991	481892490.4
1992	509938255.09999996
1993	414703675.20000005
1994	471053738.7
1995	421030000
1996	460252954.2
1997	537300471.1
1998	477108194.59999996
1999	481291999.90000004
2000	380240150
2001	451579070
2002	377466201
2003	503448713
2004	459457995
2005	500453546
2006	668227263
2007	873766309
2008	887839944
2009	1182820292
2010	1067545276
2011	1423424458
2012	1183249243
2013	1209090145
2014	1343283261
2015	1079520652
2016	1023797429
2017	889269924
2018	886694271
2019	919441710
2020	771605816