Year	current US$
1968	222419998.168945
1969	154569992.06543
1970	183040008.544922
1971	216309997.55859402
1972	244360000.61035198
1973	238229995.727539
1974	251649993.89648402
1975	366600006.10351604
1976	331450012.207031
1977	300279998.779297
1978	394369995.11718804
1979	487760009.765625
1980	617289978.027344
1981	744539978.027344
1982	672570007.324219
1983	585280029.296875
1984	566030029.296875
1985	601900024.414063
1986	731599975.585938
1987	751520019.53125
1988	880500000
1989	944070007.324219
1990	890309997.558594
1991	917289978.027344
1992	782989990.234375
1993	676020019.53125
1994	540940002.441406
1995	499890014.64843804
1996	551090026.855469
1997	668640014.648438
1998	599330017.089844
1999	507820007.324219
2000	390609985.35156304
2001	278480010.986328
2002	278529998.779297
2003	296679992.675781
2004	374070007.324219
2005	393690002.441406
2006	431809997.558594
2007	433680023.19335896
2008	489709991.455078
2009	624589965.820313
2010	596530029.296875
2011	485110015.86914104
2012	480078063.964844
2013	462210021.972656
2014	456356079.10156304
2015	418064086.91406304
2016	375289154.05273396
2017	345007873.535156
2018	300763122.558594
2019	370272979.736328
2020	397221191.40625
2021	402840820.3125
2022	390353558.96875256