Year	constant 2015 US$
1960	63530000
1961	134980000
1962	62430000
1963	77760000
1964	75090000
1965	113810000
1966	69230000
1967	47650000
1968	73200000
1969	55070000
1970	38170000
1971	56580000
1972	50650000
1973	60790000
1974	39630000
1975	56920000
1976	44460000
1977	82260000
1978	106640000
1979	124830000
1980	196210000
1981	138530000
1982	198130000
1983	158760000
1984	140480000
1985	155150000
1986	179460000
1987	112620000
1988	160750000
1989	156510000
1990	81540000
1991	139530000
1992	171230000
1993	286310000
1994	345970000
1995	245620000
1996	221650000
1997	154930000
1998	140830000
1999	99840000
2000	246320000
2001	481130000
2002	519670000
2003	401600000
2004	402650000
2005	352370000
2006	382150000
2007	506180000
2008	336070000
2009	410100000
2010	425390000
2011	371610000
2012	396750000
2013	402710000
2014	793500000
2015	916290000
2016	693220000
2017	534320000