Year	current US$
1974	16007471.8547096
1975	28547269.9725962
1976	61773580.1826061
1977	116844830.504273
1978	262553952.772775
1979	253757825.400783
1980	240747209.244531
1981	45519690.5952978
1982	-38039648.5780392
1983	-5434207.90684444
1984	-117662828.006177
1985	31177448.6576457
1986	57119648.564606
1987	-70177835.914784
1988	130609082.475178
1989	-19584660.962843
1990	-29104793.4257327
1991	57868143.3112068
1992	18139414.8808625
1993	-35004906.1368642
1994	64454673.1226965
1995	61112811.7562621
1996	157481357.943194
1997	92583141.4409122
1998	264952670.782456
1999	182656652.247952
2000	212821742.461716
2001	308164184.285563
2002	341203810.697531
2003	403426490.075716
2004	433013184.887099
2005	869538391.241801
2006	927502473.479908
2007	988114396.831893
2008	1518394703.62886
2009	1121718356.66667
2010	1842984056.33968
2011	1872680961.18059
2012	2118667697.21704
2013	2375224075.06628
2014	2434921508.31744
2015	2101262966.54669
2016	1934748459.73718
2017	1919952836.81748
2018	2721893627.61646
2019	2797300237.99801
2020	1316945702.90406