Year	constant 2015 US$
1960	32740000
1961	50400000
1962	46620000
1963	46880000
1964	75490000
1965	81620000
1966	129110000
1967	133820000
1968	132590000
1969	101670000
1970	90030000
1971	105970000
1972	150710000
1973	154480000
1974	148010000
1975	176280000
1976	160640000
1977	145620000
1978	188860000
1979	234840000
1980	224030000
1981	214980000
1982	231660000
1983	242920000
1984	250050000
1985	233540000
1986	204450000
1987	272420000
1988	234360000
1989	251940000
1990	206320000
1991	185100000
1992	148560000
1993	180810000
1994	115620000
1995	109860000
1996	85300000
1997	157300000
1998	130940000
1999	76100000
2000	41380000
2001	39850000
2002	50380000
2003	34560000
2004	54180000
2005	53310000
2006	70990000
2007	105170000
2008	684350000
2009	300190000
2010	153210000
2011	118150000
2012	72630000
2013	105540000
2014	94470000
2015	66110000
2016	90570000
2017	100420000