Year	current US$
1970	9630000.028759247
1971	11409999.907016754
1972	13369999.924674625
1973	16589999.89368022
1974	18230000.110343106
1975	28370000.021532144
1976	29540000.006556503
1977	21539999.967440974
1978	24699999.837204818
1979	31090000.251308087
1980	45719999.81440603
1981	57690000.23603439
1982	49719999.74548818
1983	46229999.989271134
1984	44510000.00163911
1985	48780000.04589557
1986	57359999.81872737
1987	52369999.345391996
1988	68199999.74407257
1989	72519999.56183136
1990	53570000.05804002
1991	49880000.14238058
1992	48630000.082775936
1993	40919999.98129906
1994	32029999.779537316
1995	24920000.176876787
1996	22849999.871104978
1997	25749999.988824114
1998	21790000.101551417
1999	22269999.831914913
2000	16180000.243708488
2001	15990000.111982236
2002	14089999.895542853
2003	16210000.075399864
2004	28109999.533742677
2005	23920000.0986457
2006	25439999.952912334
2007	28949999.768286943
2008	30859999.96960162
2009	34339999.72417951
2010	33430000.48398973
2011	24480000.022798777
2012	22876920.675071247
2013	21172459.013760082
2014	25094657.795503736
2015	19224974.952245254
2016	21768535.770475853
2017	20950592.78942425
2018	17508145.14048397
2019	24070270.39304375
2020	28525968.290865418
2021	35413129.48008999
2022	39176673.33409193