Year	US Dollars
1960	-5500000
1961	1400000
1962	1600000
1963	-10800000
1964	-10400000
1965	2300000
1966	-8000000
1967	-12100000
1968	-7800000
1969	-19300000
1970	-44800000
1971	-6000000
1972	8500000
1973	-8000000
1974	-123500000
1975	-101000000
1976	-60000000
1977	-74000000
1978	-79500050
1979	-83000050
1980	-174999950
1981	-171000000
1982	-39999950
1983	-94500050
1984	-210000000
1985	-173500050
1986	-65500000
1987	-119000000
1988	-104721030.04292
1989	-118965517.24138
1990	-83657587.54864
1991	-93667124.34405
1992	-140417250.22281
1993	-314144964.01222
1994	-344044334.50671
1995	-171324296.14181
1996	-206334459.45946
1997	-262585551.3308
1998	-398301329.39439
1999	-803484320.55749
2000	-884230367.05008
2001	-997156785.69831
2002	-974706402.85561
2003	-1144540200.40354
2004	-1633013421.10552
2005	-1787206939.75092
2006	-2279210813.9926
2007	-3443598866.87935
2008	-4564175324.09524
2009	-2603066403.4591
2010	-2839048218.85039
2011	-3489202890.50647
2012	-3591328157.84886
2013	-3778208491.7804
2014	-3526492338.18709
2015	-3552061498.64207
2016	-3304164659.5139
2017	-3514567571.13479