Year	US Dollars
1960	-20370005.8346
1961	12585994.95485
1962	16603979.34423
1963	28447988.59651
1964	41719997.27637
1965	6999997.19402
1966	17919992.8167
1967	-11199995.51044
1968	1399999.4388
1969	20999991.58207
1970	-13439994.61252
1971	-116480233.44378
1972	-45079981.97432
1973	-31906803.09723
1974	-214721592.25767
1975	-152794696.96988
1976	24142285.09477
1977	151270560.96765
1978	-517246955.94963
1979	-365202286.55243
1980	-463735451.49145
1981	-230339915.34333
1982	-315199172.35471
1983	-135299729.18967
1984	-328400773.57387
1985	-297400000.20587
1986	-292799151.96781
1987	-405900111.36694
1988	-437199897.44803
1989	-587299199.25242
1990	-483112595.51631
1991	-123448816.5218
1992	-33667421.96618
1993	284643370.0624
1994	201180008.77778
1995	-593650601.4023
1996	-832478050.38615
1997	-1139018667.91074
1998	-1206265938.00887
1999	-841697606.29751
2000	-1287548450.61732
2001	-1309467862.13884
2002	-706918301.28852
2003	-888105847.72603
2004	-1007002543.77079
2005	-1397998149.67024
2006	-2393149590.5732
2007	-3213973760.20536
2008	-4390150819.72901
2009	-3997724687.14448
2010	-5165170660.78361
2011	-7214618041.94985
2012	-6710123782.67494
2013	-7318066882.32746
2014	-9035531499.43928
2015	-7057721648.78101
2016	-6243357705.04304
2017	-8645984258.91274