Year	US Dollars
1960	377992440.1512
1961	639787204.25592
1962	743385132.29735
1963	510989780.2044
1964	198796024.07952
1965	-121797564.04872
1966	264594708.10584
1967	47599048.01904
1968	449391012.17976
1969	89598208.03584
1970	-632787344.25312
1971	-829138702.46085
1972	525562638.22037
1973	739193083.57349
1974	-201618837.38043
1975	-911426639.62137
1976	-433532658.69365
1977	1974471021.15915
1978	3043928242.87029
1979	5282660332.54157
1980	6468926553.67232
1981	-1744950400.38245
1982	-332135573.468
1983	3204485367.85487
1984	1547288971.04128
1985	5932933879.95375
1986	6999095311.58533
1987	10315682887.605
1988	7437930657.33348
1989	6630105712.44231
1990	6132647934.13984
1991	5137797414.2614
1992	5274193548.3871
1993	6080117513.84766
1994	3045792497.46536
1995	1026439855.53197
1996	2204079733.91017
1997	1723307291.66666
1998	1534106325.63356
1999	3454783533.84074
2000	3927202513.04072
2001	4800827608.6527
2002	4394998335.94828
2003	4150594207.30498
2004	-329307431.12296
2005	-659090194.59901
2006	-4700910273.08192
2007	-3993252438.1946
2008	-4652495849.34014
2009	1205257668.4208
2010	4659255415.0392
2011	3373591981.35969
2012	-5754515889.3531
2013	-8433692244.72033
2014	-5253780836.19195
2015	-4092686283.8903
2016	1817963899.16241
2017	4773589871.47804