Year	constant 2015 US$
1960	492300000
1961	613670000
1962	465700000
1963	537680000
1964	600450000
1965	628400000
1966	824170000
1967	763540000
1968	788510000
1969	712570000
1970	712830000
1971	749770000
1972	792150000
1973	984550000
1974	1242940000
1975	1314600000
1976	1785680000
1977	1574530000
1978	1869270000
1979	1660270000
1980	2065700000
1981	2230940000
1982	2010840000
1983	2356290000
1984	2353410000
1985	1996350000
1986	2094820000
1987	1912040000
1988	1723410000
1989	1974970000
1990	2342420000
1991	2162850000
1992	1812220000
1993	1993620000
1994	1961390000
1995	1661160000
1996	1698150000
1997	1576850000
1998	1611540000
1999	1505820000
2000	1547810000
2001	1419030000
2002	1660160000
2003	1446000000
2004	1320640000
2005	1266660000
2006	1374560000
2007	1697140000
2008	2327090000
2009	2103610000
2010	2373500000
2011	2153220000
2012	2145680000
2013	2126330000
2014	1721960000
2015	1663520000
2016	1694820000
2017	1943640000