Year	constant 2015 US$
1960	1040000
1961	28520000
1962	75400000
1963	70320000
1964	276960000
1965	274330000
1966	248330000
1967	231110000
1968	293450000
1969	315690000
1970	324950000
1971	293960000
1972	240820000
1973	269100000
1974	304860000
1975	328120000
1976	362560000
1977	318490000
1978	332150000
1979	353040000
1980	417150000
1981	280160000
1982	330490000
1983	382170000
1984	322130000
1985	298960000
1986	336420000
1987	389430000
1988	675190000
1989	634120000
1990	923380000
1991	846920000
1992	947380000
1993	974770000
1994	2014340000
1995	1357900000
1996	1115900000
1997	563680000
1998	1269950000
1999	574370000
2000	497780000
2001	288030000
2002	1501490000
2003	303510000
2004	173130000
2005	96330000
2006	250550000
2007	166820000
2008	535410000
2009	2160650000
2010	782530000
2011	1245100000
2012	2603760000
2013	1157160000
2014	836500000
2015	654610000
2016	616260000
2017	813090000