Year	current US$
1964	1168900000
1965	1316200000
1966	1519700000
1967	1692000000
1968	2026000000
1969	2103400000
1970	2358000000
1971	3480900000
1972	4560200000
1973	7747300000
1974	31241600000
1975	29838300000
1976	38905800000
1977	44060800000
1978	37816300000
1979	58651900000
1980	102012000000
1981	113236000000
1982	75837300000
1983	45862200000
1984	37520900000
1985	27479600000
1986	20184200000
1987	22602304940
1988	23735259279
1989	28383577036
1990	44417408545
1991	47816482777
1992	50287468091
1993	42395257944
1994	42614120961
1995	50041122296
1996	60790126313
1997	60707799315
1998	38736585848
1999	48891397554
2000	140571000000
2001	127450000000
2002	125496000000
2003	168990000000
2004	209918000000
2005	284891000000
2006	319250000000
2007	328143000000
2008	471375000000
2009	214580000000
2010	297798000000
2011	458539000000
2012	520283000000
2013	475169000000
2014	442855000000
2015	244612000000
2016	206682000000
2017	220360000000
2018	295387000000
2019	259427000000
2020	180138000000