Year	current US$
1968	146050003.05175802
1969	99279998.7792969
1970	119400001.52587901
1971	139699996.94824198
1972	146369995.117188
1973	150569992.06543
1974	149669998.168945
1975	221279998.779297
1976	190550003.05175802
1977	179080001.831055
1978	243930007.93457
1979	297619995.11718804
1980	369850006.10351604
1981	410480010.986328
1982	373839996.33789104
1983	346250000
1984	319040008.544922
1985	333589996.33789104
1986	403019989.013672
1987	427380004.88281304
1988	489380004.88281304
1989	506670013.42773396
1990	448850006.10351604
1991	450799987.792969
1992	406309997.558594
1993	364360015.86914104
1994	277139984.13085896
1995	269100006.10351604
1996	274160003.66210896
1997	360610015.86914104
1998	316959991.455078
1999	237559997.55859402
2000	222419998.168945
2001	182070007.32421902
2002	181149993.89648402
2003	189550003.05175802
2004	228320007.32421902
2005	239930007.93457
2006	266070007.324219
2007	268480010.986328
2008	295829986.57226604
2009	308929992.675781
2010	309250000
2011	239630004.882813
2012	235272140.50293
2013	220584197.998047
2014	216638916.015625
2015	190338104.248047
2016	160823669.43359402
2017	139516738.89160198
2018	93733123.7792969
2019	132367218.017578
2020	138457855.22460902
2021	161564437.866211
2022	166178590.9645259