Year	current US$
1960	101260000
1961	90000000
1962	85000000
1963	75000000
1964	52000000
1965	73000000
1966	43000000
1967	55000000
1968	52000000
1969	40000000
1970	42740000
1971	50332571.5216683
1972	59464611.0567989
1973	86601218.4283747
1974	77591855.6463244
1975	57431406.4440441
1976	92329947.3857977
1977	292587750.867411
1978	397637473.662989
1979	516897466.808891
1980	245500000
1981	327356314.48164
1982	351491004.173597
1983	296950981.540859
1984	510767497.236855
1985	451156414.762742
1986	352600000
1987	279056052.717445
1988	221921112.621281
1989	244209606.53928
1990	422912156.606109
1991	685128999.127437
1992	926530104.362891
1993	1629333224.56765
1994	2045708229.59899
1995	2087724671.18954
1996	1961549366.43698
1997	2024140356.90385
1998	1979765808.94518
1999	1635546217.42514
2000	1039004779.84766
2001	1286808046.33814
2002	1630952754.12207
2003	2264929820.89601
2004	2131906401.49586
2005	2649511714.26121
2006	2726202557.18232
2007	3379531319.25438
2008	2468702083.33783
2009	4616053405.83902
2010	6709723941.93013
2011	6247923422.3814
2012	6377644967.274
2013	6611350278.0129
2014	7315701487.5645
2015	6543431215.10578
2016	5188554799.83484
2017	7030555455.01321
2018	6100102144.08238
2019	6689823666.95442
2020	5256670223.95083
2021	2962484486.37687