Year	US Dollars
1960	-16815294.11765
1961	14527428.57143
1962	11649047.61905
1963	7076039.60396
1964	-109545272.72727
1965	-52981818.18182
1966	-312818181.81818
1967	-27763659.94236
1968	-30732814.37126
1969	-52678263.47305
1970	-134807724.5509
1971	-357907844.31138
1972	-279441077.84431
1973	-191616826.3473
1974	-273453173.6527
1975	-524950059.88024
1976	-723256699.27422
1977	-1153531838.87916
1978	484449617.22488
1979	392882864.16896
1980	18218951.50487
1981	-376269446.66286
1982	-246140357.46902
1983	-115857697.5905
1984	-8195231.33889
1985	135031600.25871
1986	55005942.78812
1987	-220682698.64787
1988	-205850424.58656
1989	58736822.78672
1990	27977851.10335
1991	0
1992	-92964337.93522
1993	238623921.32413
1994	159121472.38236
1995	268404527.6952
1996	-17933674.99309
1997	228406523.41212
1998	-192629263.19815
1999	287089027.27273
2000	-785507246.37681
2001	-79333333.33333
2002	176816093.09122
2003	-538977309.67194
2004	-399273347.54029
2005	-768866396.68009
2006	-659449351.53033
2007	-334444767.7428
2008	-1131248726.62192
2009	-1737898551.89119
2010	-1838542962.00746
2011	-1593514299.43138
2012	-1976907945.01255
2013	-1494475514.1683
2014	-1805139380.8176
2015	-1471698121.79298
2016	-1803051790.05001
2017	-1425699296.38901