Year	current US$
1960	5800000
1961	6400000
1962	1000000
1963	8400000
1964	17830000
1965	29850000
1966	33880000
1967	28590000
1968	28600000
1969	30300000
1970	32820000
1971	39649150.4290203
1972	44257152.1668283
1973	54929832.9243378
1974	176220040.162618
1975	139529730.055758
1976	151063977.431962
1977	211088440.814208
1978	169768527.098242
1979	178200000
1980	106100000
1981	99839674.5584418
1982	155911031.074549
1983	160136104.276958
1984	251639208.382791
1985	200010984.182777
1986	163670857.338569
1987	97314186.6106768
1988	105826913.91584
1989	204900000
1990	166810086.639826
1991	106371521.549443
1992	181792546.097048
1993	223386892.216689
1994	450958647.772345
1995	659954209.427882
1996	955010418.559974
1997	1086643726.25318
1998	948491205.029463
1999	974931910.336526
2000	926431168.382596
2001	886421960.900623
2002	580458218.556947
2003	716795371.945774
2004	872372122.861509
2005	1327603534.2382
2006	2614812412.54798
2007	4554023296.60844
2008	6927359027.5215
2009	7583785263.62136
2010	8133860291.42495
2011	9910714358.23311
2012	11659294426.12
2013	12782730516.2821
2014	13480889094.5477
2015	11600788401.4687
2016	8487385112.51074
2017	8473883546.85806
2018	7177825599.93464
2019	4373778649.7488
2020	2662435863.69535
2021	2242414461.36919
2022	1274909495.56873
2023	241058645.156204