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	1742760000
1991	2718010000
1992	1112220000
1993	1688500000
1994	2507570000
1995	3231140000
1996	3490410000
1997	3299510000
1998	3720280000
1999	5793690000
2000	5961570000
2001	6254520000
2002	7443970000
2003	5406590000
2004	5290270000
2005	5279540000
2006	6223300000
2007	5413150000
2008	6418840000
2009	7240470000
2010	6642990000
2011	9040990000
2012	8821190000
2013	7673690000
2014	8849300000
2015	8377110000
2016	9526650000
2017	9320640000