Year	current US$
1960	1259900000
1961	1010600000
1964	701000000
1966	638600000
1967	635500000
1968	807300000
1969	994300000
1970	1242700000
1971	1221240000
1972	1472960000
1973	2407460000
1974	4246620000
1975	6014920000
1976	5338260000
1977	7053310000
1978	8600550000
1979	8402650000
1980	10558880000
1981	11266980000
1982	10737860000
1983	10395430000
1984	10481747480
1985	9843540000
1986	9228070000
1987	7042270000
1988	7462509000
1989	9225549000
1990	9679131000
1991	7683286000
1992	8647869000
1993	8761206000
1994	9570628000
1995	10782446900
1996	9105615000
1997	8692345628
1998	9403615533
1999	9172862989
2000	9012460879
2001	9738670547
2002	11807676735
2003	13582615141
2004	18154777835
2005	19834693921
2006	21359452266
2007	27270680921
2008	39448841252
2009	39283693897
2010	40448774580
2011	47246186310
2012	50349199817
2013	54849490324
2014	56575635090
2015	49725081602
2016	47777615496
2017	50125424523
2018	49630603544
2019	35198875701
2020	32461764827