Year	constant 2015 US$
1960	1629200000
1961	1653680000
1962	2495840000
1963	3264720000
1964	3399600000
1965	3327490000
1966	2416820000
1967	2998360000
1968	2475010000
1969	1960540000
1970	2368630000
1971	2291610000
1972	1511170000
1973	1246440000
1974	1827510000
1975	2614020000
1976	3423280000
1977	1902650000
1978	1728900000
1979	1706250000
1980	2585260000
1981	1836000000
1982	2085870000
1983	1651650000
1984	1695510000
1985	1755770000
1986	1726430000
1987	1343940000
1988	2071470000
1989	2190300000
1990	1589900000
1991	1934770000
1992	1292150000
1993	1352240000
1994	1903350000
1995	832250000
1996	1136060000
1997	1121690000
1998	1264830000
1999	918190000
2000	846710000
2001	2612830000
2002	2760230000
2003	1231620000
2004	1553520000
2005	1751490000
2006	2292730000
2007	2231660000
2008	1399390000
2009	2687090000
2010	2941420000
2011	3212120000
2012	1856010000
2013	2030750000
2014	3303510000
2015	3709380000
2016	2949860000
2017	2257360000