Year	current US$
1960	13900000
1961	700000
1963	22000000
1964	28900000
1965	26100000
1966	30900000
1967	28900000
1968	35200000
1969	35596000
1970	32704000
1971	36603000
1972	39754000
1973	37560000
1974	48449000
1975	47177000
1976	58510000
1977	81306000
1978	71710000
1979	79554000
1980	115996000
1981	85371000
1982	107315000
1983	75337000
1984	85926000
1985	92328000
1986	124610405.2
1987	86165532.52
1988	97587770.28999999
1989	124817319
1990	283402585.8
1991	109066972
1992	107105311.3
1993	109736483.39999999
1994	143264929.20000002
1995	187367256.1
1996	122480579.5
1997	98404759.97
1998	231219119.4
1999	223209402.89999998
2000	83661614
2001	73953341
2002	56697080
2003	65987063.00000001
2004	102350743
2005	110347141
2006	81401928
2007	107379406
2008	112967756
2009	82711096
2010	90328622
2011	105307384
2012	114581442
2013	53441154
2014	28329284
2015	190465100
2016	122463347
2017	199641883
2018	55631617
2019	46219941
2020	59698052