Year	current US$
1960	54200000
1961	53300000
1963	58700000
1964	80400000
1965	94000000
1966	89400000
1967	102315000
1968	99953000
1969	110060000
1970	115226000
1971	125708000
1972	143567000
1973	157035000
1974	229064000
1975	253433000
1976	293508000
1977	395630000
1978	405628000
1979	426150000
1980	484039000
1981	554536000
1982	511716000
1983	426891000
1984	388170000
1985	327740000
1986	326918319.3
1987	293643697.5
1988	350642549
1989	442277310.9
1990	483271012.6
1991	513544993.4
1992	552695234.8
1993	1030664780.0000001
1994	432034755.8
1995	585492264.5
1996	500770000
1997	658141000
1998	551630000
1999	501479201.2
2000	525038327
2001	210111604
2002	214509755
2003	271409118
2004	271845481
2005	341257268
2006	330549633
2007	382706691
2008	515422818
2009	509992558
2010	511684817
2011	499641286
2012	521180397
2013	661038269
2014	1830822962
2015	1908359107
2016	1177450102
2017	1055520606
2018	1530817400
2019	1716112749
2020	1432117526