Year	US Dollars
1965	-21280000
1966	-47560000
1967	-29480000
1968	-17720000
1969	-27360000
1970	3240000
1971	-23520000
1972	12240000
1973	-43600000
1974	-140160000
1975	-97400000
1976	-29640000
1977	20360000
1978	-289760100
1979	-5880000
1980	32760000
1981	-237480000
1982	-193513600
1983	-190070900
1984	-248349900
1985	-287422100
1986	-165115800
1987	-281417600
1988	-271267100
1989	-457015400
1990	-608053457.71477
1991	-698660500
1992	-953944800
1993	-987523100
1994	-1175191700
1995	-1449972700
1996	-1246211200
1997	-1176867900
1998	-1323240700
1999	-1376411000
2000	-1774285500
2001	-1949502700
2002	-1886066700
2003	-2170692600
2004	-2466327000
2005	-2819475700
2006	-3452169500
2007	-4505900000
2008	-4889700000
2009	-3198000000
2010	-3623900000
2011	-4323100000
2012	-4394600000
2013	-4676800000
2014	-4355234400
2015	-4197580000
2016	-3880940000
2017	-4284448000