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	362350000
1989	198950000
1990	1727760000
1991	2137050000
1992	419220000
1993	608660000
1994	226750000
1995	373820000
1996	259220000
1997	1940000
1998	37010000
1999	35270000
2000	418970000
2001	249680000
2002	383670000
2003	194270000
2004	300430000
2005	411630000
2006	564050000
2007	717980000
2008	953020000
2009	1159590000
2010	896230000
2011	2768150000
2012	2793450000
2013	2455890000
2014	2956770000
2015	2147390000
2016	3613070000
2017	3057470000