Year	current US$
1970	4948624.74332036
1971	4609953.17772982
1972	4757922.8439303
1973	7532914.81211081
1974	8804628.63912683
1975	18942273.4119543
1976	12367126.9430671
1977	39568391.5054906
1978	40133240.2263477
1979	18460734.0217141
1980	22610979.3886033
1981	19769002.9265234
1982	30115394.8933241
1983	21921399.252809
1984	17277922.6438779
1985	12309482.0257047
1986	22773530.1104433
1987	21422225.8646266
1988	22651039.9194464
1989	22152915.6318659
1990	26441286.0131968
1991	38565898.4835597
1992	38925052.3121604
1993	36388017.2460207
1994	32466810.6941272
1995	40806463.8158921
1996	39770759.7729041
1997	22697916.0995855
1998	21028268.8433687
1999	23748182.4351281
2000	22170731.8879344
2001	22652100.6085192
2002	25431168.7960022
2003	28831326.9410003
2004	24321368.6921318
2005	24848306.5569626
2006	36955080.01401
2007	48917955.0754612
2008	45693410.6515094
2009	42452923.9805302
2010	74046974.9217622
2011	73445660.5320891
2012	63226573.0558139
2013	56852870.638649
2014	57947143.8008305
2015	65177888.2534843
2016	70245689.2453305
2017	55258328.4642491
2018	39689498.5773739
2019	42617946.0354593
2020	47826248.1135501
2021	48443461.4794406