Year	current US$
1970	9732705.95970669
1971	8974162.13619238
1972	9081506.43836698
1973	11858241.1831985
1974	19325387.9998385
1975	15274928.8493175
1976	18393168.1183006
1977	22459424.4205947
1978	22553972.4683416
1979	31706314.1838776
1980	43239695.9712365
1981	40472506.5730337
1982	31748640.7691731
1983	28461375.1391946
1984	29907538.714534
1985	31819448.9373798
1986	36940789.9608448
1987	34647314.4540973
1988	39415661.4847315
1989	36123766.8903147
1990	29723987.809441
1991	39469374.6196225
1992	42081609.0705863
1993	5729111.95564276
1994	4365028.09207935
1995	4385514.8353061
1996	4613975.72535723
1997	4462941.4948999
1998	3008677.37867847
1999	2589467.91767526
2000	4407411.41443241
2001	2456982.59952315
2002	2893690.02341859
2003	3535170.70885232
2004	3879499.85979038
2005	3863246.47280198
2006	4817655.86226446
2007	7983620.52035772
2008	8980120.67581598
2009	9010111.18401143
2010	7868992.22112283
2011	27102197.7961183
2012	22486375.4559551
2013	21100579.4041581
2014	22389904.4489697
2015	21790468.1980577
2016	18624861.5712389
2017	23881050.0340064
2018	21226969.6859988
2019	21261516.3258732
2020	20308413.1606433
2021	25282157.8798906