Year	current US$
1970	562519774.99209
1971	798585572.8429986
1972	635325923.7008111
1973	1115219544.4040937
1974	3393498137.487301
1975	1312902133.4236362
1976	3809685066.034541
1977	3048086691.5001693
1978	5947511005.756857
1979	11832712495.767015
1980	16782666666.666668
1981	-11601666666.666668
1982	-16989666666.666668
1983	-3383548387.096774
1984	-1877741935.483871
1985	-2262258064.516129
1986	-4696129032.258064
1987	-1649354838.7096775
1988	-1958709677.419355
1989	-595806451.6129032
1990	487741935.483871
1991	-4935638.808837655
1992	-4187590.1875901874
1993	-4061727.998973339
1994	-1135554.0579570613
1995	-1321085.3698461303
1996	-893639.5589580624
1997	4465659136.559998
1998	4856391982.182629
1999	6253336187.061908
2000	12609021035.598705
2001	1362594677.8981287
2002	7039463164.823169
2003	120768808.99808836
2004	-2817920476.2464104
2005	-3527987369.423058
2006	8086942210.042866
2007	15730222489.074627
2008	25797838917.08465
2009	125996304.75452876
2010	7391500000
2011	30952800000
2012	33590227292.64308
2013	27961900000
2014	20331200000
2015	-939731582.221511
2016	2715797629.1278577
2017	15073295270.27027
2018	35932000422.74361
2019	16620400000
2020	-4055319724.855216
2021	27553600000