Year	constant 2015 US$
1960	10310000
1961	9280000
1962	96320000
1963	38930000
1964	29250000
1965	34960000
1966	31400000
1967	21220000
1968	49500000
1969	67210000
1970	49090000
1971	66480000
1972	48090000
1973	74490000
1974	65780000
1975	80100000
1976	101730000
1977	87970000
1978	83320000
1979	85490000
1980	84260000
1981	93930000
1982	83470000
1983	81340000
1984	79130000
1985	82720000
1986	90880000
1987	66010000
1988	89800000
1989	70400000
1990	77860000
1991	68030000
1992	95030000
1993	87620000
1994	56570000
1995	57320000
1996	57360000
1997	58810000
1998	53400000
1999	47020000
2000	41120000
2001	39910000
2002	48430000
2003	63230000
2004	74150000
2005	73690000
2006	63550000
2007	51230000
2008	44180000
2009	64080000
2010	66910000
2011	58990000
2012	83320000
2013	76120000
2014	81140000
2015	103480000
2016	117420000
2017	141070000