Year	constant 2015 US$
1960	270000
1961	31050000
1962	50190000
1963	48850000
1964	120660000
1965	129440000
1966	130860000
1967	136580000
1968	137970000
1969	152380000
1970	140240000
1971	176100000
1972	155940000
1973	201270000
1974	318430000
1975	229010000
1976	200530000
1977	256960000
1978	329860000
1979	202760000
1980	76810000
1981	137200000
1982	153340000
1983	219150000
1984	287010000
1985	452300000
1986	318040000
1987	340320000
1988	420070000
1989	406050000
1990	430820000
1991	362490000
1992	306520000
1993	297700000
1994	271310000
1995	267540000
1996	345800000
1997	294110000
1998	227280000
1999	246980000
2000	188870000
2001	279590000
2002	319220000
2003	300240000
2004	365920000
2005	419510000
2006	303620000
2007	353600000
2008	398790000
2009	535740000
2010	471680000
2011	413200000
2012	440280000
2013	418950000
2014	349960000
2015	608190000
2016	624460000
2017	634650000