Year	constant 2015 US$
1960	1850000
1961	1430000
1962	290000
1963	-1200000
1964	3150000
1965	3910000
1966	4810000
1967	4880000
1968	4170000
1969	8070000
1970	10630000
1971	13440000
1972	17500000
1973	21360000
1974	53590000
1975	60550000
1976	139160000
1977	128140000
1978	127350000
1979	106680000
1980	96990000
1981	61710000
1982	81050000
1983	85300000
1984	86590000
1985	98420000
1986	80350000
1987	82400000
1988	95190000
1989	93340000
1990	70640000
1991	48770000
1992	30900000
1993	59880000
1994	61860000
1995	76980000
1996	69580000
1997	86550000
1998	105810000
1999	81710000
2000	67590000
2001	81800000
2002	88380000
2003	93110000
2004	109940000
2005	96150000
2006	86570000
2007	93170000
2008	110280000
2009	102360000
2010	120520000
2011	75830000
2012	74310000
2013	87410000
2014	190160000
2015	533900000
2016	2677750000
2017	648800000