Year	constant 2015 US$
1960	612990000
1961	631580000
1962	554930000
1963	551690000
1964	503390000
1965	450170000
1966	481120000
1967	343370000
1968	294390000
1969	300900000
1970	472130000
1971	329460000
1972	512050000
1973	890340000
1974	1220580000
1975	1715260000
1976	1921610000
1977	1365330000
1978	1288290000
1979	3489130000
1980	3470280000
1981	2826520000
1982	2083260000
1983	1978170000
1984	1651900000
1985	1433010000
1986	1205360000
1987	1088690000
1988	749570000
1989	535740000
1990	1310680000
1991	1184700000
1992	529370000
1993	411810000
1994	439470000
1995	588420000
1996	574570000
1997	576580000
1998	542150000
1999	559660000
2000	730470000
2001	623160000
2002	763460000
2003	1657500000
2004	723620000
2005	811680000
2006	645460000
2007	654860000
2008	745180000
2009	760320000
2010	959550000
2011	959060000
2012	1129690000
2013	1312390000
2014	2558850000
2015	2168560000
2016	2738380000
2017	2869570000