Year	constant 2015 US$
1960	3530000
1961	62330000
1962	77530000
1963	68640000
1964	202680000
1965	235890000
1966	339460000
1967	262980000
1968	329910000
1969	247170000
1970	365590000
1971	277380000
1972	321610000
1973	264440000
1974	244020000
1975	368020000
1976	449760000
1977	562820000
1978	466720000
1979	629100000
1980	549260000
1981	445350000
1982	503000000
1983	306860000
1984	468760000
1985	386950000
1986	435200000
1987	335750000
1988	440410000
1989	748650000
1990	619550000
1991	713440000
1992	899390000
1993	704400000
1994	925660000
1995	502930000
1996	473180000
1997	640320000
1998	654390000
1999	564150000
2000	538210000
2001	680680000
2002	854250000
2003	1034020000
2004	834910000
2005	436440000
2006	1731080000
2007	1776080000
2008	483430000
2009	591360000
2010	493110000
2011	527660000
2012	542200000
2013	668830000
2014	751090000
2015	666870000
2016	757050000
2017	1187370000