Year	US Dollars
1960	-81609024.95433
1961	-98224365.00322
1962	-1520136.52338
1963	-136540480.0845
1964	-52950733.76343
1965	-4087019.22889
1966	-131222480.73613
1967	83800830.49592
1968	98599029.08656
1969	263016664.99084
1970	509970552.64219
1971	501677740.31741
1972	1038297222.98598
1973	775742289.38108
1974	105960646.23032
1975	16233629.48338
1976	-4929467.08464
1977	-793187169.38661
1978	-1086503778.66018
1979	-2371235828.28839
1980	-3974547247.89626
1981	-2545812038.24424
1982	-1915443492.84831
1983	19736094.67455
1984	163603951.41022
1985	557773557.98628
1986	2265012642.22503
1987	2200387682.33387
1988	3292045968.18431
1989	2965510135.13514
1990	2834369024.62578
1991	3154930183.10691
1992	5136094228.35634
1993	6425178987.87313
1994	7983595731.85435
1995	10030514504.6524
1996	7949706840.39088
1997	8732070365.35859
1998	8626028006.2236
1999	9888237800.98018
2000	6271420674.40575
2001	7958836689.03803
2002	14249388292.8666
2003	16594130925.5079
2004	17439408989.3221
2005	14201716204.4522
2006	15279387780.7051
2007	18014371749.2472
2008	2509740735.31566
2009	10964434565.157
2010	8688091990.69821
2011	2726886319.60113
2012	3070435110.42867
2013	6469681466.33856
2014	3365658154.06189
2015	6185819957.74472
2016	6222324582.4015
2017	3467893783.3743