Year	constant 2015 US$
1960	1239950000
1961	1143710000
1962	1189600000
1963	1445420000
1964	1539700000
1965	1892640000
1966	3005500000
1967	2601490000
1968	2450720000
1969	2420140000
1970	2158430000
1971	2208530000
1972	2606400000
1973	2013550000
1974	2740960000
1975	1334600000
1976	721750000
1977	832530000
1978	1080850000
1979	869420000
1980	558250000
1981	590930000
1982	567360000
1983	353220000
1984	366290000
1985	361670000
1986	359410000
1987	205380000
1988	242430000
1989	185560000
1990	234300000
1991	290010000
1992	640680000
1993	356120000
1994	1155100000
1995	900620000
1996	1090470000
1997	1240990000
1998	1480570000
1999	1645790000
2000	1922820000
2001	1912730000
2002	1671670000
2003	2039060000
2004	1928430000
2005	1979060000
2006	1910260000
2007	2431910000
2008	2315430000
2009	3423760000
2010	2660130000
2011	3043000000
2012	3482980000
2013	3714330000
2014	3920030000
2015	3273390000
2016	2894780000
2017	2370450000