Year	current US$
1967	33415906.523834378
1968	23759980.992015205
1969	22319982.144014284
1970	35279971.776022576
1971	85659287.77670836
1972	109439694.81959388
1973	126612599.66464771
1974	504053271.56919515
1975	746960046.3231037
1976	918066010.4226984
1977	839316155.1823972
1978	791835263.4626521
1979	971047770.700637
1980	1333526635.7845976
1981	1666473943.254198
1982	2009264910.2489867
1983	2100752750.4342792
1984	2643913815.117097
1985	2759449326.1338468
1986	2351943285.285694
1987	1467620286.0858257
1988	1329259297.7893367
1989	1155266319.8959687
1990	1442912873.8621585
1991	1703511053.3159947
1992	2036410923.276983
1993	2190637191.157347
1994	2033810143.0429127
1995	2067620286.0858257
1996	2092327698.3094928
1997	2794538361.5084524
1998	4766431729.518855
1999	3402560728.2184653
2000	2998489986.996099
2001	3348158387.516255
2002	3828040572.1716514
2003	5019304031.209363
2004	6909371651.495448
2005	6659692327.698309
2006	10104633289.986996
2007	14339812483.745123
2008	22217254876.46294
2009	13649289206.762028
2010	13022844213.263979
2011	21437191157.347202
2012	26406241872.561768
2013	29100130039.011703
2014	26532119635.890766
2015	28628348504.551365
2016	27111313394.018204
2017	27364629388.816643
2018	28984473342.0026
2019	23657680364.109234
2020	20966715734.720417
2021	19762822626.788036