Year	current US$
1960	236500000
1961	197100000
1962	233600000
1963	228400000
1964	234800000
1965	212300000
1966	294000000
1967	263800000
1968	311900000
1969	369100000
1970	359730000
1971	440260000
1972	539530000
1973	613250000
1974	1229700000
1975	1685430000
1976	2362230000
1977	2657390000
1978	2458660000
1979	3329170000
1980	4116990000
1981	5008220000
1982	4014760000
1983	4542390000
1984	3977410000
1985	3967500000
1986	2642740000
1987	2470150000
1988	2226609443
1989	2083596548
1990	2392291136
1991	2743378797
1992	3454388330
1993	4142687928.9999995
1994	5251269881
1995	4708776303
1996	5331545657
1997	4027679287
1998	3895322049
1999	3831610156
2000	17108811403
2001	18980785249
2002	18720298501
2003	21373289603
2004	26245805155
2005	8368967934
2006	12000536145
2007	60985005203
2008	74781116662
2009	63627236597
2010	72357136460
2011	19985378859
2012	12583373715
2013	8846144851
2014	10220108649
2015	6274757996
2016	4933617519
2017	6153320986
2018	7336833454
2019	6656109765
2020	5444629701