Year	current US$
1970	54031490.8776454
1971	34929148.9518288
1972	149875948.09661
1973	307210691.749451
1974	4968284011.85873
1975	3441382734.65689
1976	4184424453.22143
1977	5177102825.81084
1978	4036172491.54657
1979	13816210542.0525
1980	10804400518.5856
1981	3771943974.81202
1982	1234424920.03766
1983	2428515099.13452
1984	3377725967.65075
1985	4122434381.41687
1986	1394449080.71129
1987	2668671816.74138
1988	2286656138.63721
1989	5725428216.75638
1990	7562760328.22124
1991	4384060327.17096
1992	5126355396.55024
1993	4895330514.98735
1994	3812477803.48205
1995	4358127722.738
1996	5213891560.18302
1997	4839087413.25147
1998	2310186667.36505
1999	3009531925.36832
2000	8342054253.8215
2001	5753835177.96338
2002	4886667405.02406
2003	6439185731.71138
2004	10278610064.2599
2005	16067343591.9496
2006	17747939625.1669
2007	18514785945.6425
2008	25077976382.5181
2009	12262183819.6915
2010	23164343302.6877
2011	33716554196.0151
2012	31288057885.8132
2013	25491865067.6335
2014	20312658646.1866
2015	7143073800.70456
2016	5021196707.78969
2017	9491091387.21769
2018	15297028958.5602
2019	14232490794.4597
2020	6611014288.49971
2021	11589584656.8005