Year	current US$
1960	215500000
1961	210300000
1962	251200000
1963	257300000
1964	223700000
1965	212200000
1966	184800000
1967	127700000
1968	109600000
1969	131634999.99999999
1970	105869000
1971	123484000
1972	122972000
1973	130491000.00000001
1974	192399000
1975	158399000
1976	192597000
1977	204049000
1978	308997000
1979	389022000
1980	415038000
1981	446123000
1982	390963892.90000004
1983	378080299.7
1984	300618562.8
1985	302744961.90000004
1986	287694653
1987	218584260.7
1988	147432910.60000002
1989	214516912.9
1990	408736395.4
1991	526987084.50000006
1992	683572763.4
1993	864361035.3000001
1994	939751943.0999999
1995	1197834557
1996	1183021277
1997	1132062105
1998	1138602612
1999	1393304153
2000	3455672121
2001	4275449023.9999995
2002	4406721137
2003	4155613078.0000005
2004	4448006299
2005	5171205753
2006	5949128629
2007	6396156949
2008	7867349392
2009	7490516801
2010	7892191942
2011	8145630667
2012	9072122073
2013	11442141754
2014	11407430507
2015	11432014710
2016	11836878265
2017	13878307858
2018	16704442702
2019	18111966859
2020	16999353648