Year	US Dollars
1960	-1540160.90476
1961	-40367904.54104
1962	-65526030.10821
1963	-112790972.4403
1964	-12494575.1903
1965	-171662185.14925
1966	-220173271.82089
1967	-294726144.38411
1968	-43953904.77261
1969	41315403.43928
1970	136918186.97933
1971	-77548357.44703
1972	-59463419.35401
1973	-222259286.5478
1974	-1002633463.68734
1975	-1822267324.53086
1976	-1269550900.17908
1977	-971417454.88425
1978	81830209.86756
1979	1344503765.29341
1980	616130148.84043
1981	-899834241.06086
1982	-748279816.51376
1983	40525604.81395
1984	781944043.84194
1985	1226500000
1986	-248650000
1987	-418200000
1988	-466704000
1989	27564710.5689
1990	508322303.24905
1991	-774221750.86772
1992	-1061106845.80934
1993	-1346342114.52416
1994	-1517027863.77709
1995	-3053462186.36404
1996	-2774314468.48389
1997	-2625375375.37538
1998	-3078787465.0099
1999	-1210518540.40479
2000	-1035559758.15926
2001	-968615489.86631
2002	-383204935.04278
2003	237698321.45321
2004	2596227078.32913
2005	4822398155.73149
2006	8233372014.90259
2007	7515819750.71908
2008	1231415974.57193
2009	5765885399.37588
2010	5870942621.50013
2011	8617697251.37069
2012	4391113133.15136
2013	-343091898.29379
2014	-3291299753.43431
2015	-4912385378.72127
2016	-725015555.09466
2017	3509062471.24851