Year	current US$
1970	1204720.76592896
1971	1051734.25809808
1972	1215905.58218302
1973	2069666.01187482
1974	2279999.55927066
1975	3186583.01624773
1976	2870580.92383602
1977	5300642.62036542
1978	5626554.7670275
1979	5175777.88699848
1980	6605272.32017571
1981	5835369.9250338
1982	8630650.2047069
1983	5977442.91185667
1984	5510463.79872601
1985	4185941.28304259
1986	7072243.54825618
1987	7630486.16599435
1988	8939933.03289836
1989	9977084.67772261
1990	13806840.6388485
1991	14564815.1030056
1992	16514358.6831443
1993	16262734.2688772
1994	17708355.1641016
1995	23870570.4288973
1996	22881939.2546984
1997	20967816.879117
1998	21401118.3359561
1999	16305415.3657377
2000	17661361.870844
2001	17113471.17284
2002	20513364.4398013
2003	29820708.3924502
2004	24526480.6401994
2005	27047332.4360656
2006	28773204.0364391
2007	38914955.9214903
2008	49740492.6054882
2009	47818356.9919197
2010	46766764.4808504
2011	62977241.4546458
2012	81804807.2898808
2013	81252599.2656671
2014	64434990.7953434
2015	76611222.7786231
2016	97404146.5326003
2017	97717358.370341
2018	45484418.0970303
2019	51033301.8360856
2020	54988344.7700358
2021	58232091.5495608