Year	current US$
1976	33253625.0791748
1977	65581550.3973407
1978	70523592.5210615
1979	156036568.727374
1980	226747268.855722
1981	202021284.062882
1982	197630080.578661
1983	145983921.573109
1984	227813077.618532
1985	229963707.03386
1986	410002132.037846
1987	448156527.543655
1988	469181149.723991
1989	577291478.024134
1990	524619028.018406
1991	198139744.896915
1992	333214871.856238
1993	727273204.068316
1994	907840873.226174
1995	771814600.572405
1996	551392045.448081
1997	351866189.272921
1998	1172157471.65886
1999	517767013.824449
2000	365084923.1631
2001	392629281.628602
2002	614340547.230453
2003	904631545.353814
2004	940996789.616244
2005	1016992331.65081
2006	1138784248.04318
2007	463887429.781378
2008	766226429.064231
2009	1116438221.84254
2010	313983172.083848
2011	1250181508.52425
2012	-30546427.8906527
2013	-489206187.664911
2014	-1000608543.65883
2015	-28587586.9449248
2016	183973204.873549
2017	830279431.063857
2018	925621110.695336
2019	700196459.254838
2020	-674724795.3333
2021	-549801080.869095