Year	US Dollars
1960	-26632727.41739
1961	-38782407.74204
1962	-25538341.56397
1963	-27658858.0136
1964	-51009650.99671
1965	-31289999.174
1966	-15272320.93977
1967	-49141556.49652
1968	-74264599.47841
1969	-112019697.76232
1970	-102156969.96512
1971	-168274664.143
1972	-100108988.24461
1973	47418730.64272
1974	257353364.909
1975	-252304944.89839
1976	-176622665.8411
1977	-202494067.55622
1978	-456853997.53226
1979	-37340899.7337
1980	-130348483.84922
1981	-148222051.72271
1982	-617818157.31189
1983	41716997.4599
1984	286589379.48495
1985	625158676.06296
1986	-283586940.23567
1987	-975977844.73965
1988	-606990967.19003
1989	-631599763.66271
1990	142309217.34643
1991	365682841.42071
1992	626230115.05753
1993	-587012506.25313
1994	-730790395.1976
1995	-815438719.35968
1996	83465732.86643
1997	-548409204.6023
1998	-2129759879.93997
1999	698160080.04002
2000	877967983.992
2001	-1052031000
2002	-1824792000
2003	-663197000
2004	-569565000
2005	-358406000
2006	447599000
2007	651062000
2008	166964000
2009	-1004462000
2010	-3139261000
2011	-1782012000.00001
2012	-1249842000
2013	-2216121000
2014	-1632159000
2015	-2708080000.00001
2016	522701000
2017	-541611000