Year	current US$
1977	181210214.355454
1978	22118906.496094
1979	-186289490.787852
1980	-254122106.608526
1981	29528162.653375
1982	-620052081.323876
1983	-728154209.536362
1984	243768879.715416
1985	134638015.636795
1986	23627380.3575073
1987	-259445881.861702
1988	102281510.690469
1989	-70463579.5764178
1990	-264806017.914048
1991	-643448430.427427
1992	-939204070.144482
1993	-190921234.17923
1994	-572595685.948442
2009	-1501014230.0253
2010	-1235104413.49161
2011	-1309388690.31577
2012	-3632235296.65524
2013	-2306443564.63447
2014	-2355162003.85928
2015	-3408765065.96951
2016	-2539966740.58289
2017	-1755980379.4872
2018	2056151190.29712
2019	2512036333.14671
2020	1566677883.5493