Year	current US$
1970	9549982.06852273
1971	11926705.9814659
1972	11240518.9620758
1973	12467228.1215672
1974	15210770.3281027
1975	14939569.3447557
1976	14313253.0120482
1977	18676415.0902647
1978	21806967.6951523
1979	23664318.6037459
1980	28444772.8112303
1981	30025019.5465207
1982	28859876.8356228
1983	29959310.0102145
1984	28806422.456488
1985	24804839.7417253
1986	26951802.6973296
1987	31533119.0292933
1988	35804279.0770311
1989	36968435.4412032
1990	44098977.610026
1991	51768702.0297506
1992	38731555.9070851
1993	73038439.0842192
1994	38712302.1610733
1995	44552170.6065939
1996	103133570.042787
1997	115950536.323967
1998	65729653.3435629
1999	70234565.9905961
2000	76992771.9315863
2001	59254261.0651644
2002	121316009.679682
2003	111174049.811222
2004	123341802.822315
2005	133122641.672936
2006	149186995.884201
2007	169988030.054514
2008	208690826.996798
2009	246884229.137507
2010	281636334.109593
2011	387321629.325786
2012	286378768.120632
2013	257656499.594376
2014	406216846.856806
2015	352993702.817405
2016	250071806.227992
2017	406327949.941243
2018	449149466.678363
2019	501146251.645611
2020	554728905.337366
2021	573111341.48716