Year	constant 2015 US$
1960	3153610000
1961	6219060000
1962	5612020000
1963	6443190000
1964	6295190000
1965	6909660000
1966	9093470000
1967	7719790000
1968	8732260000
1969	7686190000
1970	7334300000
1971	7067090000
1972	7094430000
1973	6224850000
1974	8166010000
1975	7069980000
1976	6102670000
1977	7952270000
1978	7634000000
1979	7221990000
1980	8790110000
1981	10679100000
1982	9711130000
1983	9027630000
1984	9374000000
1985	10897350000
1986	8809360000
1987	8660560000
1988	8771920000
1989	9337750000
1990	11037780000
1991	10967080000
1992	10479500000
1993	10885200000
1994	11314290000
1995	10646850000
1996	10304940000
1997	10382020000
1998	12334720000
1999	13253140000
2000	11564160000
2001	12255460000
2002	13020260000
2003	11249540000
2004	11286440000
2005	11270680000
2006	12297550000
2007	11784540000
2008	12486160000
2009	13295590000
2010	11117530000
2011	12053860000
2012	13249290000
2013	11799700000
2014	13062730000
2015	12454300000
2016	11969550000
2017	11752790000