Year	US Dollars
1975	-72941700
1976	102049600
1977	51387400
1978	88609200
1979	-44584700
1980	-210760500
1981	-519152300
1982	-452102700
1983	-235329300
1984	-15490200
1985	11154600
1986	157208100
1987	184764900
1988	264166500
1989	134406100
1990	6538600
1991	-283839000
1992	-625049100
1993	-113411600
1994	-132269900
1995	-190874000
1996	16295900
1997	-598308400
1998	-110617800
1999	267085300
2000	150664400
2001	136900000
2002	-199000000
2003	-324059700
2004	-412198100
2005	-514885200
2006	-593837200
2007	-455221900
2008	-1174044400
2009	-2206066700
2010	-2871019600
2011	-2801335700
2012	-4079500300
2013	-2802748200
2014	-2497634100
2015	-3678895600
2016	-2328568300
2017	-2368636300