Year	constant 2021 US$
1966	46310001.373291
1967	71559997.55859381
1968	58349998.4741211
1969	44229999.5422363
1970	55900001.5258789
1971	58509998.3215332
1972	57790000.9155273
1973	82379997.253418
1974	122260002.13623
1975	79040000.9155273
1976	95180000.3051758
1977	45369998.9318848
1978	43310001.373291
1979	52569999.6948242
1980	104040000.915527
1981	119730003.35693401
1982	102610000.61035201
1983	101760002.13623
1984	120849998.47412099
1985	133529998.779297
1986	102010002.13623
1987	100879997.253418
1988	90569999.6948242
1989	78870002.746582
1990	68699996.9482422
1991	97790000.9155273
1992	68440002.44140631
1993	70239997.8637695
1994	55669998.1689453
1995	51740001.6784668
1996	51750000
1997	43880001.0681152
1998	58330001.8310547
1999	32819999.694824196
2000	32520000.4577637
2001	46110000.6103516
2002	43439998.626709
2003	33060001.373291
2004	31340000.1525879
2005	27409999.8474121
2006	36380001.0681152
2007	44360000.6103516
2008	40380001.0681152
2009	50069999.6948242
2010	72959999.0844727
2011	53200000.762939505
2012	100989997.86377
2013	80900001.5258789
2014	74599998.4741211
2015	74800003.0517578
2016	61380001.0681152
2017	74739997.8637695
2018	96849998.4741211
2019	80059997.55859381
2020	139669998.168945
2021	153639999.38964802
2022	146770004.272461