Year	current US$
1976	141137442.082103
1977	237399693.799025
1978	227073205.46763
1979	200051862.37604
1980	267945311.870524
1981	182030862.913041
1982	50936911.9618686
1983	-15434815.4706725
1984	8535068.5323627
1985	-31903914.573709
1986	75811374.1840842
1987	116403658.405478
1988	112835540.451164
1989	41186451.4732008
1990	24508073.8204989
1991	72621936.4683146
1992	82087624.0958033
1993	210377531.107082
1994	287399926.977086
1995	323134967.502773
1996	438497694.577016
1997	565648779.605229
1998	585909726.846511
1999	361080457.220733
2000	160910225.968483
2001	437661582.446349
2002	803020373.257777
2003	479915418.777391
2004	425482071.58955
2005	-93184154.9358058
2006	-486693551.779527
2007	26116182.9797635
2008	-2669714623.57291
2009	-2066340539.6322
2010	-1950072133.11058
2011	-1558919845.25761
2012	-1270001292.50588
2013	152937625.260786
2014	356022800.423798
2015	880225826.817591
2016	1610354903.41417
2017	1569150967.17559
2018	835074624.028492
2019	2061775187.72314
2020	203211077.924375
2021	-291314692.424987