Year	current US$
1970	22927662.63825
1971	25141327.1118538
1972	30679155.8447404
1973	36866748.1502655
1974	53224329.5436878
1975	71479459.8096138
1976	72466319.9827572
1977	89235089.1372084
1978	105570512.248042
1979	131727387.584708
1980	177626250
1981	253370308.098
1982	372508291.666667
1983	359959291.666667
1984	376322916.666667
1985	372475346.938776
1986	215167865.085778
1987	204654004.724111
1988	198967202.97643
1989	165707294.117647
1990	172835270.588235
1991	182830296.701741
1992	192359357.677906
1993	167394966.178679
1994	154195110.128441
1995	167931225.932277
1996	173102216.316131
1997	171409846.025881
1998	136857892.193131
1999	182658851.886837
2000	191908874.130925
2001	248567197.10582
2002	295085190.522829
2003	304924866.273767
2004	378076617.865041
2005	455587213.033828
2006	533556454.089777
2007	646810852.882615
2008	850862413.223946
2009	591527886.393279
2010	700415153.676649
2011	766042567.856586
2012	857048470.454238
2013	949258141.01495
2014	994488807.664278
2015	970390582.772266
2016	856189439.195017
2017	900398811.276008
2018	907197171.08215
2019	907664867.616676
2020	794131175.283955
2021	967445130.69179