Year	constant 2015 US$
1960	217680000
1961	232660000
1962	205530000
1963	267030000
1964	175150000
1965	225960000
1966	349850000
1967	100380000
1968	230610000
1969	223630000
1970	171450000
1971	183800000
1972	159370000
1973	240910000
1974	330680000
1975	581140000
1976	357120000
1977	740310000
1978	715030000
1979	662030000
1980	1077340000
1981	899330000
1982	1136530000
1983	822190000
1984	888060000
1985	853100000
1986	1003580000
1987	999060000
1988	690300000
1989	672850000
1990	725770000
1991	247040000
1992	932740000
1993	1314390000
1994	778060000
1995	239860000
1996	107160000
1997	110160000
1998	111390000
1999	160900000
2000	153700000
2001	224280000
2002	215210000
2003	216810000
2004	222650000
2005	256040000
2006	407730000
2007	368810000
2008	715600000
2009	631970000
2010	467810000
2011	937060000
2012	891210000
2013	941080000
2014	975960000
2015	1236570000
2016	1183640000
2017	1743360000