Year	constant 2015 US$
1960	1545490000
1961	2601360000
1962	2649450000
1963	2566180000
1964	1724320000
1965	1735910000
1966	2104190000
1967	1347670000
1968	1131910000
1969	1197280000
1970	770450000
1971	1064520000
1972	1269530000
1973	878950000
1974	380990000
1975	265430000
1976	577490000
1977	279570000
1978	268170000
1979	1258410000
1980	2039780000
1981	1639150000
1982	1448860000
1983	823770000
1984	560360000
1985	466790000
1986	683920000
1987	597690000
1988	438680000
1989	282090000
1990	1805170000
1991	2928450000
1992	2919790000
1993	5049340000
1994	3669110000
1995	3687150000
1996	3702640000
1997	3329900000
1998	3807540000
1999	6316270000
2000	6323440000
2001	6316100000
2002	8488820000
2003	5396790000
2004	5258760000
2005	5224270000
2006	6339940000
2007	5582200000
2008	6553160000
2009	7479530000
2010	6731750000
2011	9211510000
2012	9007640000
2013	7887450000
2014	9062340000
2015	8534070000
2016	9658340000
2017	9458990000