Year	current US$
1960	387000000
1961	401700000
1962	356100000
1963	311800000
1964	402900000
1965	435600000
1966	491500000
1967	423200000
1968	413600000
1969	433100000
1970	505000000
1971	627400000
1972	717200000
1973	905400000
1974	2364400000
1975	4202899999.9999995
1976	3899500000
1977	4480600000
1978	4212399999.9999995
1981	20361524700
1982	21134160027
1983	9928164563
1984	9755025184
1985	10569956210
1986	8920382087
1987	7298298350
1988	9293004271
1989	9898698894
1990	6525514837
1991	422899943
1992	602684169.5
1993	532713219.90000004
1994	498660895.70000005
1995	665443007.1
1996	568380004.4
1997	1136239217
1998	1852825530
1999	2110304020
2000	3408555889
2001	5778407772
2002	6136674548
2003	5038721494
2004	10428845729
2005	10428236954
2006	10702515133
2007	13653126982
2008	27659858945
2009	32018889345
2010	33785500721.999996
2011	32938345677.999996
2012	39003350560
2013	44512165253
2014	45391195235
2015	37557604774
2016	31442700904
2017	35786244857
2018	36508625131
2019	39296147811
2020	36240819148