Year	current US$
1964	299900000
1965	376300000
1966	456900000
1967	501400000
1968	572700000
1969	747500000
1970	709900000
1971	817100000
1972	1135500000
1973	1976400000
1974	2857300000
1975	4213500000
1976	8693500000
1977	14653800000
1978	20348700000
1979	24257300000
1980	30166400000
1981	35235800000
1982	40654500000
1983	39180600000
1984	33695800000.000004
1985	23621900000
1986	19112400000
1987	20022000000
1988	21784544192
1989	21153928705
1990	24080993057
1991	29073804806
1992	33272655273.999996
1993	28202398398
1994	23343588251
1995	27450043525
1996	27764945527
1997	28487882407
1998	30012555674
1999	28031677971
2000	30099866139
2001	31151701166
2002	32125067954
2003	36776962364
2004	44549611119
2005	59282232810
2006	68197830588
2007	88517143330
2008	113157000000
2009	93190893952
2010	104444000000
2011	128983000000
2012	152500000000
2013	164462000000
2014	169911000000
2015	174675000000
2016	140169000000
2017	127910000000
2018	126630000000
2019	132158000000
2020	132611000000