Year	US Dollars
1960	-198230484.93672
1961	-515175271.58696
1962	260947474.52122
1963	-178071452.57028
1964	278866614.40251
1965	-530854518.98309
1966	-599171239.78049
1967	-306865270.46702
1968	-714525702.76627
1969	-505095755.40374
1970	-100795161.83223
1971	-124314032.92642
1972	442757009.34579
1973	1997437540.03844
1974	-57479734.70892
1975	-441076061.72334
1976	146224631.28703
1977	-695113558.15554
1978	-1142567110.30905
1979	-1412018630.0125
1980	788857938.71866
1981	-3235806339.25462
1982	-6378682555.44522
1983	-3597566682.26486
1984	-2760369498.2793
1985	-3693334356.06351
1986	-5591074426.41298
1987	-3024086818.42245
1988	-1557043073.34109
1989	-5487338164.64458
1990	-5989226625.62523
1991	-431677262.3813
1992	885180342.99777
1993	-999859471.61327
1994	-1661016949.15254
1995	-7226017226.01723
1996	-1817147192.71623
1997	1194240100.17217
1998	-3507427253.61189
1999	-9508710364.70736
2000	-8967531244.11229
2001	326285284.96297
2002	-31917120.13395
2003	-9824111822.947
2004	-16623986342.2962
2005	-19006164486.5434
2006	-13551212938.0054
2007	-14026850906.8069
2008	-26845120859.4449
2009	1964364600.20616
2010	-11801286003.6995
2011	13493049393.6705
2012	-3845122705.71252
2013	-20428849902.5341
2014	-6274671807.58285
2015	-20525002080.0399
2016	-27367156791.3816
2017	8572290519.64703