Year	constant 2015 US$
1960	1007820000
1961	1292630000
1962	1493860000
1963	1508640000
1964	1057220000
1965	1259850000
1966	1337870000
1967	1303260000
1968	1170610000
1969	1088560000
1970	985410000
1971	1073180000
1972	1086040000
1973	354900000
1974	181550000
1975	191420000
1976	482260000
1977	296750000
1978	408530000
1979	1344540000
1980	2084350000
1981	1676180000
1982	1466230000
1983	812570000
1984	552360000
1985	438000000
1986	646310000
1987	538770000
1988	370900000
1989	215570000
1990	5022310000
1991	9340220000
1992	7565600000
1993	7997190000
1994	8812830000
1995	11602200000
1996	8227080000
1997	7071060000
1998	8446580000
1999	12290930000
2000	12831870000
2001	12109440000
2002	12625850000
2003	10541540000
2004	11165210000
2005	5279540000
2006	6223300000
2007	5413150000
2008	6418840000
2009	7240470000
2010	6642990000
2011	9041220000
2012	8821190000
2013	7673690000
2014	8849300000
2015	8377110000
2016	9526650000
2017	9320640000