Year	current US$
1976	480749919.374061
1977	680336626.569788
1978	395550684.968917
1979	818078928.78724
1980	1553117506.62255
1981	1682008091.43903
1982	1136046251.57864
1983	891369281.446131
1984	851829035.528576
1985	366561679.944468
1986	707286699.004892
1987	507839044.853578
1988	668219881.877848
1989	867829155.842399
1990	581960111.923042
1991	258638121.42943
1992	535047640.496876
1993	1002822735.8998
1994	1213017083.18812
1995	1495805493.65781
1996	1385439780.60371
1997	1310068707.66979
1998	1105257063.19179
1999	1318733151.42726
2000	1248287144.60496
2001	1154564751.02097
2002	1680867709.51977
2003	2600745506.66182
2004	2365024007.31917
2005	1086681984.40557
2006	1523437980.24892
2007	999340785.242808
2008	4456935311.12304
2009	4847584039.48722
2010	5642656146.05759
2011	4258946494.30973
2012	2919628752.76491
2013	3369513738.26989
2014	4464552811.11978
2015	3545601656.39203
2016	2531181403.35208
2017	2104646230.11814
2018	2218579131.26832
2019	3898575215.78841
2020	2278912536.07899
2021	1860657987.82514