Year	current US$
1970	32209999.084472697
1971	35990001.6784668
1972	36659999.8474121
1973	32720001.220703095
1974	61930000.3051758
1975	71629997.253418
1976	51939998.626709
1977	64139999.38964839
1978	107199996.94824201
1979	165380004.882813
1980	198399993.89648402
1981	160639999.38964802
1982	153490005.493164
1983	179169998.168945
1984	169050003.05175802
1985	168300003.05175802
1986	206389999.38964802
1987	227410003.66210902
1988	235050003.05175802
1989	303980010.986328
1990	348950012.207031
1991	343470001.220703
1992	423459991.455078
1993	468040008.544922
1994	479230010.986328
1995	470220001.220703
1996	461630004.88281304
1997	260309997.558594
1998	251399993.89648402
1999	221059997.55859402
2000	226169998.168945
2001	228580001.831055
2002	209349990.84472698
2003	231059997.55859402
2004	236619995.117188
2005	267429992.675781
2006	294040008.544922
2007	355809997.558594
2008	357369995.11718804
2009	376420013.42773396
2010	392190002.441406
2011	383540008.544922
2012	327113067.626953
2013	368977172.85156304
2014	413117675.78125
2015	438255065.917969
2016	443671295.16601604
2017	448397735.595703
2018	461474822.998047
2019	480986999.511719
2020	443522003.173828
2021	426096984.863281
2022	424053001.40380865