Year	current US$
1977	66559997.55859381
1979	148960006.71386698
1980	149589996.33789098
1981	128949996.948242
1982	113209999.084473
1983	122010002.13623
1984	118879997.253418
1985	127239997.86377
1986	100949996.94824201
1987	106489997.86377
1988	128779998.779297
1989	156470001.220703
1990	179250000
1991	171490005.493164
1992	127309997.558594
1993	134089996.337891
1994	201190002.44140598
1995	229570007.32421902
1996	215520004.272461
1997	217440002.44140598
1998	215500000
1999	186839996.33789098
2000	133830001.831055
2001	312989990.234375
2002	311809997.558594
2003	272220001.220703
2004	196000000
2005	200380004.882813
2006	211279998.779297
2007	214970001.220703
2008	272179992.675781
2009	345209991.455078
2010	312450012.207031
2011	312579986.57226604
2012	331134063.720703
2013	352390686.035156
2014	338140289.30664104
2015	312704284.667969
2016	257516052.246094
2017	214686401.367188
2018	210963455.200195
2019	402001281.738281
2020	421682647.705078
2021	328230041.503906
2022	315514371.663332