Year	US Dollars
1960	-8832286.39327
1961	-9149902.73914
1962	-263069676.36954
1963	-17161538.99764
1964	150139738.73665
1965	474987147.83251
1966	225450250.41095
1967	0
1968	-206594912.09593
1969	24981601.38817
1970	-177912553.31385
1971	-848612874.35743
1972	-927784676.01716
1973	-975055646.87812
1974	-6172123572.14926
1975	-4907560235.7633
1976	-3659545985.35254
1977	-1172207021.18182
1978	-2387152105.92509
1979	-4615615400.08842
1980	-5295341312.05211
1981	-999146350.18273
1982	-1872613597.52443
1983	4906714630.16912
1984	11753827695.2235
1985	11487450779.4235
1986	6601570980.52759
1987	9608553068.45426
1988	17166386286.1892
1989	14761099609.375
1990	5720000000
1991	4600000000
1992	9947500000
1993	6160807453.41614
1994	-15642108.55623
1995	-14822283208.0201
1996	-18498238583.2256
1997	-23041884322.82
1998	-20535751831.1073
1999	-11102893976.9659
2000	-14836530035.5288
2001	-12266271490.5195
2002	4281225391.51795
2003	12401305459.8635
2004	22845588205.12819
2005	30323126848.5048
2006	29983078196.1109
2007	19038611268.0397
2008	-3214745337.55041
2009	-6721981594.47837
2010	-22994542974.0792
2011	-20128527020.5644
2012	-33506732886.1809
2013	-56911553267.47369
2014	-65366765830.8541
2015	-20783912951.9974
2016	7444246488.96535
2017	20871434166.8234