Year	current US$
1960	465400000
1961	435100000
1962	464500000
1963	447100000
1964	548400000
1965	538100000
1966	507400000
1967	509900000
1968	561600000
1969	608820000
1970	728670000
1971	686120000
1972	860230000
1973	1169350000
1974	1409100000
1975	1467010000
1976	1742330000
1977	2424170000
1978	3036740000
1979	3324470000
1980	3942850000
1981	2955350000
1982	3094030000
1983	3079960000
1984	3482170000
1985	3551430000
1986	5107360000
1987	5024240000
1988	5024942000
1989	5737917817
1990	6752231577
1991	7242511000
1992	7062531000
1993	7449343000
1994	9033604563
1995	9853993938
1996	10431773860
1997	11554526600
1998	10873344156
1999	11623740497
2000	13042988168
2001	12159795721
2002	11448803801
2003	12662508842
2004	16157130939
2005	20712429539
2006	23274244009
2007	28466880936
2008	37072137062
2009	32560287946
2010	39353720070
2011	55724018370
2012	59618935461
2013	58821860009
2014	54794652251
2015	35675657457
2016	31390361512
2017	37240881241
2018	41819392864
2019	39485080766
2020	31053209022