Year	current US$
1970	307367.237642679
1971	274175.63048421
1972	316149.211848002
1973	447507.834329982
1974	364839.805850321
1975	725859.400603562
1976	650056.02207256
1977	720093.370468755
1978	1040273.20308966
1979	1485017.73769557
1980	1123279.39805024
1981	877824.221781161
1982	863947.024676023
1983	468724.796972398
1984	225374.556178415
1985	288524.379214586
1986	548881.494802658
1987	910251.797459482
1988	892449.008552807
1989	987624.347146426
1990	891258.367771265
1991	676782.901772168
1992	628921.464354198
1993	809702.393413757
1994	671614.669516859
1995	477655.894357609
1996	585995.376243308
1997	533684.690565644
1998	838966.425247372
1999	852220.13616807
2000	527001.188735401
2001	521742.888315322
2002	527201.148103334
2003	599565.502794434
2004	435356.349212036
2005	415234.684826896
2006	560029.780668204
2007	662122.615967587
2008	826583.530331706
2009	999925.643080902
2010	650840.689250864
2011	500743.046804284
2012	391719.754628948
2013	177503.450068787
2014	109366.340586911
2015	78251.6097811366
2016	396540.529918576
2017	397675.603503939
2018	300781.658557409
2019	286884.710836722
2020	234978.201908111
2021	245217.176486621