Year	current US$
1964	45320000
1965	60300000
1966	84260000
1967	86570000
1968	77330000
1969	81147000
1970	94205000
1971	109042000
1972	129667000
1973	143160000
1974	187877000
1975	250012000
1976	205734000
1977	234854000
1978	338768000
1979	399220000
1980	438790000
1981	347868000
1982	290832000
1983	312375000
1984	270566000
1985	281206000
1986	246861000
1987	298000000
1988	459805508.6
1989	560456769.6
1990	626613244.2
1991	617872496.6
1992	724331956.3
1993	510097099.4
1994	587675561.5
1995	500431000
1996	570133710.8000001
1997	611242937
1998	556178824.6
1999	628429919.4
2000	539658866
2001	569246594
2002	703306882
2003	791607505
2004	936599961
2005	1172538162
2006	1213765217
2007	1386664517
2008	2212123924
2009	2025847375
2010	2177308480
2011	2432115581
2012	2333339073
2013	2848866560
2014	2778455415
2015	2313337004
2016	2211331452
2017	2548925132
2018	2708436916
2019	2943005763
2020	2339742910