Year	constant 2015 US$
1960	37330000
1961	64780000
1962	79220000
1963	113810000
1964	127960000
1965	130840000
1966	160650000
1967	165560000
1968	146940000
1969	116970000
1970	135920000
1971	141440000
1972	120760000
1973	155290000
1974	179670000
1975	240880000
1976	258550000
1977	168320000
1978	114450000
1979	157890000
1980	97030000
1981	134190000
1982	125630000
1983	149460000
1984	323320000
1985	310080000
1986	281520000
1987	380990000
1988	279180000
1989	254460000
1990	226170000
1991	324360000
1992	303340000
1993	312630000
1994	269560000
1995	251280000
1996	291110000
1997	196170000
1998	225890000
1999	194490000
2000	207840000
2001	252630000
2002	306290000
2003	224440000
2004	187790000
2005	253680000
2006	204860000
2007	202560000
2008	203010000
2009	187560000
2010	139090000
2011	150030000
2012	141190000
2013	135660000
2014	146010000
2015	319720000
2016	243710000
2017	196770000