Year	current US$
1964	5850000
1965	7950000
1966	9450000
1967	8370000
1968	6550000
1969	5990000
1970	8110000
1971	10939434.3434335
1972	11384579.55903
1973	16240624.8907179
1974	28045553.1651838
1975	28551676.388286
1976	20635249.8569149
1977	24394652.8364082
1978	26072159.2556765
1979	1928959.17707442
1980	5670000
1981	3948197.73268408
1982	8386497.19278623
1983	2917512.95625558
1984	2259208.38279066
1985	1733936.73110721
1986	13562845.8894475
1987	25757394.9126814
1988	19049152.7499294
1989	20589297.1850606
1990	55386774.693773
1991	67615345.6636485
1992	94033759.9515998
1993	105752905.657865
1994	98016031.71081
1995	106146503.014591
1996	102133831.517675
1997	96038245.6500151
1998	106362060.432404
1999	111246412.788519
2000	109431118.885128
2001	106013174.398906
2002	106877406.671452
2003	59306559.0279377
2004	83774361.4655419
2005	98312848.5390224
2006	120615997.843097
2007	142784444.74383
2008	116517122.951593
2009	224175097.050901
2010	201627626.678787
2011	223241852.815922
2012	236241441.119079
2013	210553598.677805
2014	159330829.415719
2015	111040203.229818
2016	87635582.4178872
2017	169969976.48625
2018	191773260.980301
2019	256957421.665427
2020	387046403.563775
2021	652670952.247777
2022	568244498.422456
2023	577028229.488264