Year	constant 2015 US$
1960	10090000
1961	5160000
1962	15150000
1963	32730000
1964	76960000
1965	75360000
1966	26310000
1967	24470000
1968	16560000
1969	28490000
1970	49410000
1971	91490000
1972	114350000
1973	60140000
1974	16800000
1975	391280000
1976	68780000
1977	243840000
1978	180170000
1979	64980000
1980	25680000
1981	592350000
1982	9300000
1983	16430000
1984	-2270000
1985	46080000
1986	47870000
1987	116480000
1988	14640000
1989	22920000
1990	91380000
1991	830470000
1992	176720000
1993	227480000
1994	353010000
1995	429210000
1996	431090000
1997	283130000
1998	157110000
1999	109280000
2000	150530000
2001	185080000
2002	161090000
2003	2893060000
2004	5426830000
2005	24552180000
2006	9809280000
2007	9428940000
2008	9388420000
2009	3024000000
2010	2271100000
2011	1878400000
2012	1203450000
2013	1463750000
2014	1281350000
2015	1513880000
2016	2287900000
2017	2858900000