Year	current US$
1970	7622537836.111111
1971	3575873940.658331
1972	4405432715.698158
1973	7183242784.274076
1974	12285186654.455505
1975	1318301138.0196266
1976	3555788438.8093166
1977	4654050918.029124
1978	4544079362.597813
1979	8186848028.657479
1980	6879220678.413413
1981	6207608923.358476
1982	5528819034.458061
1983	2405355188.8180666
1984	6235198770.642781
1985	9077463424.777328
1986	11106706748.999228
1987	6348975887.995852
1988	19174930960.728573
1989	20589369431.53451
1990	15782585423.968784
1991	20621839893.63558
1992	8427864538.303199
1993	3797737005.58824
1994	1559567860.7699215
1995	18176773024.763023
1996	22218422472.69926
1997	23659630600.317875
1998	12632796380.284067
1999	-32527469826.208794
2000	-3463074917.29728
2001	1049133169.147421
2002	-15123456790.123457
2003	-2367736676.629275
2004	15377150092.889559
2005	7309137692.323047
2006	1511617008.8727963
2007	16652583575.01051
2008	29452541856.33638
2009	-54010843207.392105
2010	-1689453305.7833586
2011	11805978997.601599
2012	14506747629.783436
2013	-7240076172.137454
2014	-2359719823.4777656
2015	8618351827.815975
2016	3748406374.170071
2017	10231251507.193754
2018	18850208918.282887
2019	12391561691.680279
2020	-12517960470.356363
2021	13149368056.893732
2022	26613304098.36956