Year	constant 2015 US$
1960	-78950000
1961	277190000
1962	297030000
1963	468110000
1964	354190000
1965	225140000
1966	554800000
1967	645220000
1968	1128780000
1969	656940000
1970	838710000
1971	648220000
1972	565180000
1973	625210000
1974	415390000
1975	286550000
1976	248130000
1977	143820000
1978	184760000
1979	119980000
1980	186080000
1981	229650000
1982	230880000
1983	205960000
1984	218940000
1985	162360000
1986	125950000
1987	124040000
1988	93960000
1989	102340000
1990	114280000
1991	148820000
1992	299850000
1993	116480000
1994	85660000
1995	194630000
1996	216340000
1997	248310000
1998	221690000
1999	410050000
2000	265970000
2001	533520000
2002	598220000
2003	1024200000
2004	625800000
2005	727960000
2006	1114350000
2007	752120000
2008	998090000
2009	1077330000
2010	644770000
2011	970000000
2012	728530000
2013	788850000
2014	1099390000
2015	1355510000
2016	1106500000
2017	826020000