Year	constant 2021 US$
1973	250000
1974	10250000
1975	11470000.2670288
1976	10140000.3433228
1977	12630000.1144409
1978	8550000.19073486
1979	8039999.961853029
1980	9829999.92370605
1981	16639999.389648398
1982	16370000.839233398
1983	20780000.6866455
1984	66959999.0844727
1985	81949996.9482422
1986	53759998.3215332
1987	39130001.0681152
1988	37849998.4741211
1989	26840000.1525879
1990	21799999.237060502
1991	24190000.5340576
1992	19049999.237060502
1993	11770000.4577637
1994	34619998.9318848
1995	12560000.4196167
1996	14460000.038146999
1997	11789999.961853001
1998	8689999.5803833
1999	14529999.7329712
2000	22530000.6866455
2001	16520000.4577637
2002	15090000.1525879
2003	12199999.8092651
2004	18530000.6866455
2005	63369998.9318848
2006	31579999.9237061
2007	18920000.0762939
2008	31549999.237060502
2009	45479999.5422363
2010	34310001.373291
2011	9739999.77111816
2012	7780000.20980835
2013	12819999.6948242
2014	40229999.5422363
2015	27430000.3051758
2016	9180000.30517578
2017	6570000.17166138
2018	34119998.9318848
2019	16090000.152587902
2020	73900001.5258789
2021	68139999.3896484
2022	-97019996.6430664