Year	current US$
1970	7591312.72371533
1971	7747707.41681701
1972	7687603.44538647
1973	12619574.631645
1974	13307286.5842041
1975	18866268.0885199
1976	20080746.9088029
1977	23666548.1256371
1978	20396543.1045824
1979	26736286.1943672
1980	31690756.9674312
1981	24906436.6438728
1982	24145708.9567859
1983	23245433.6898573
1984	19059167.5070362
1985	19855166.9545414
1986	28116401.0473411
1987	24042540.9777166
1988	33334674.9871297
1989	32632009.7210132
1990	32042219.4698456
1991	28168396.8291112
1992	23389398.4813219
1993	21140650.0651293
1994	21370782.7248834
1995	23691785.9960964
1996	27322659.7910847
1997	18162714.6864909
1998	13907442.0410655
1999	18620478.8376951
2000	17422180.4251618
2001	15385880.995637
2002	15162601.704239
2003	21253454.6143944
2004	17224101.6044847
2005	17567811.8964914
2006	20308049.6249571
2007	28469748.6836188
2008	31860207.315387
2009	20470880.8844813
2010	20747252.8234044
2011	22495321.8267461
2012	26028743.5728628
2013	30165922.935872
2014	30191477.8921723
2015	24159906.1700255
2016	24082752.531689
2017	28138353.2566317
2018	27680303.2717587
2019	19615899.4117248
2020	17125276.6153085
2021	18428624.9868798