Year	current US$
1977	72321807.1374281
1978	39592001.0912017
1979	56992646.2946574
1980	153474863.025868
1981	110339452.360787
1982	222461202.561874
1983	273778798.442908
1984	173384867.91729
1985	277148498.788576
1986	277696726.477927
1987	327993850.105064
1989	444312388.320656
1990	420934169.190108
1991	288714101.846594
1992	435764052.885396
1993	351202145.260932
1994	326811966.796935
1995	881559447.964904
1996	1244521123.25107
1997	1477157226.79924
1998	1508216956.90044
1999	2132310338.27365
2000	2110652900.22819
2001	1855057842.89066
2002	2280924477.17275
2003	2180479746.37625
2004	2353718467.07642
2005	2291975641.72796
2006	1996586835.63946
2007	2237699922.27888
2008	2052156273.96632
2009	1809992050.91044
2010	1628411644.48814
2011	1345253258.93245
2012	1528714954.63254
2013	1422243614.86622
2014	1410842245.60422
2015	1427773889.05065
2016	1631009362.07661
2017	1186876479.38699
2018	1007852329.46256
2019	1792291321.33916
2020	544251148.513816
2021	227709077.920259