Year	constant 2015 US$
1960	3723920000
1961	3479450000
1962	3940650000
1963	3636560000
1964	3615720000
1965	4976440000
1966	6012570000
1967	7189490000
1968	7450390000
1969	7484060000
1970	7849280000
1971	8561960000
1972	8808040000
1973	8484580000
1974	9442700000
1975	7126850000
1976	5976410000
1977	5208900000
1978	6327900000
1979	6911050000
1980	7246130000
1981	7980610000
1982	7881310000
1983	7956730000
1984	8250860000
1985	8541500000
1986	8236210000
1987	8309480000
1988	8882260000
1989	9376180000
1990	10138320000
1991	9230450000
1992	11337840000
1993	10684270000
1994	10380320000
1995	9812610000
1996	8608050000
1997	8089760000
1998	10030460000
1999	10749730000
2000	10027430000
2001	9439700000
2002	9062560000
2003	8046680000
2004	7101950000
2005	9442520000
2006	7877930000
2007	7960080000
2008	7321400000
2009	9102130000
2010	8307310000
2011	6029840000
2012	7077900000
2013	9892000000
2014	7642420000
2015	7644500000
2016	6979690000
2017	7113840000