Year	current US$
1975	23020683.33551512
1976	17009776.365636073
1977	19519960.079840317
1978	28212887.718896646
1979	31178962.66487816
1980	36066955.13550444
1981	41854746.03539416
1982	40111573.181864284
1983	42100000
1984	40447564.72136902
1985	43380822.683148265
1986	47652406.4171123
1987	52761517.99467862
1988	71192856.53251304
1989	66790623.758442596
1990	73924988.42413953
1991	80059386.08668827
1992	67147205.10726747
1993	65851156.06936417
1994	89714437.20648387
1995	113125344.24423638
1996	128182482.34434614
1997	109624060.15037593
1998	112420241.28686327
1999	69908898.89540148
2000	78967841.67495878
2001	81835860.16124079
2002	100992479.56113264
2003	114642788.17073436
2004	130587040.24973321
2005	148878243.57476184
2006	151727852.4174801
2007	173802121.77167836
2008	181538345.79504156
2009	201533779.09937108
2010	222620080.1372359
2011	259274520.3888307
2012	286989094.5477458
2013	282042112.77946997
2014	254911838.79093197
2015	281828034.79363537
2016	266085846.79974115
2017	302974454.4616817
2018	323571965.15244895
2019	333826308.87206316
2020	314845765.2261955
2021	285500995.4278364