Year	current US$
1971	146356045.799656
1972	163248821.999499
1973	210536226.578308
1974	247461832.56332
1975	294418993.464931
1976	357367954.318649
1977	419672627.334736
1978	373682299.675048
1979	475084492.522312
1980	480248031.339166
1981	527989158.807261
1982	429280988.412855
1983	477593418.811171
1984	572962510.267521
1985	418854945.848202
1986	480028227.373383
1987	571318238.434749
1988	670479778.966102
1989	1016046852.06164
1990	1539419359.33098
1991	1949562252.54523
1992	323599031.757139
1993	457641777.875182
1994	656857444.164897
1995	747235377.159327
1996	789226669.012541
1997	857353928.62814
1998	856467966.05561
1999	741038773.688128
2000	1086989301.23041
2001	1158474294.54967
2002	1330399735.48567
2003	1486964276.95801
2004	2051922733.06709
2005	3132411018.36676
2006	3576883881.60382
2007	4319026691.53602
2008	4636717486.57877
2009	929457368.679706
2010	1077970363.30973
2011	5651926888.58064
2012	4406565530.00302
2013	4733568439.6454
2014	5190604535.03593
2015	6363302410.79556
2016	7325563626.59485
2017	8926894751.69848
2018	2634142203.1645
2019	2575494550.34048
2020	1985812229.12807
2021	2308983322.31171