Year	current US$
1971	2569999.9332428
1972	5579999.92370605
1973	2450000.04768372
1974	18149999.6185303
1975	26739999.7711182
1976	11770000.4577637
1977	27059999.4659424
1978	63610000.6103516
1979	45860000.6103516
1980	53159999.8474121
1981	54659999.8474121
1982	72160003.6621094
1983	30850000.3814697
1984	61029998.779296905
1985	41770000.4577637
1986	40919998.1689453
1987	66970001.220703095
1988	71800003.0517578
1989	65889999.38964839
1990	71519996.6430664
1991	57270000.4577637
1992	72120002.746582
1993	53169998.1689453
1994	54529998.779296905
1995	57500000
1996	67150001.5258789
1997	63659999.8474121
1998	57889999.3896484
1999	36139999.3896484
2000	32630001.068115197
2001	43229999.5422363
2002	44310001.373291
2003	57450000.762939505
2004	65230003.356933594
2005	60680000.3051758
2006	67449996.9482422
2007	99449996.9482422
2008	84739997.8637695
2009	70349998.4741211
2010	78569999.6948242
2011	77750000
2012	66540000.9155273
2013	72010002.1362305
2014	70220001.2207031
2015	46599998.4741211
2016	38240001.6784668
2017	49630001.0681152
2018	47580001.8310547
2019	43830001.8310547
2020	32400001.5258789
2021	30069999.6948242
2022	24200000.762939498