Year	current US$
1960	15400000
1961	6000000
1962	16700000
1963	38950000
1964	38400000
1965	47800000
1966	40600000
1967	29400000
1968	32600000
1969	36800000
1970	29120000
1971	52800000
1972	55313164.3314838
1973	84335171.0249535
1974	87127562.5750864
1975	112644400.748805
1976	123494225.705515
1977	180104358.396463
1978	154049196.183003
1979	238611138.055764
1980	201800000
1981	225197246.085501
1982	128984646.951104
1983	171288274.101438
1984	253501885.923604
1985	340101493.848858
1986	376300000
1987	182214186.610677
1988	254040370.87376
1989	164000000
1990	61600000
1991	441857217.239554
1992	499796250.360939
1993	651224433.947187
1994	252088132.739565
1995	365556192.279792
1996	350251265.780119
1997	391034294.384957
1998	501855654.767965
1999	693972747.340443
2000	627192942.125822
2001	1099475738.92325
2002	468412793.71139
2003	271909943.78349
2004	818409602.968921
2005	1920468046.76764
2006	2263790168.10921
2007	3029510311.31634
2008	2678597079.16656
2009	3560281795.74604
2010	3848743718.77531
2011	4086418161.35283
2012	3528197182.41412
2013	4678588976.01792
2014	4839720595.88809
2015	5246649594.25313
2016	6113262020.35062
2017	6849184985.30285
2018	7694112505.7843
2019	8843077478.35982
2020	10810213184.4271
2021	13091343649.1642
2022	14489816963.5404
2023	15508981572.1804