Year	constant 2015 US$
1960	91120000
1961	86960000
1962	63070000
1963	55010000
1964	24090000
1965	59120000
1966	56410000
1967	57270000
1968	124000000
1969	56650000
1970	113300000
1971	32830000
1972	72960000
1973	53420000
1974	549960000
1975	50860000
1976	135420000
1977	422610000
1978	633130000
1979	298520000
1980	649680000
1981	1043720000
1982	443780000
1983	297370000
1984	180450000
1985	194100000
1986	122830000
1987	173470000
1988	232110000
1989	194090000
1990	402650000
1991	172190000
1992	142440000
1993	189030000
1994	295080000
1995	218840000
1996	281850000
1997	336340000
1998	446750000
1999	256920000
2000	286750000
2001	281100000
2002	277820000
2003	635760000
2004	288860000
2005	246660000
2006	844410000
2007	936250000
2008	960000000
2009	544500000
2010	415400000
2011	422450000
2012	684180000
2013	547440000
2014	724410000
2015	961350000
2016	1138520000
2017	1279880000