Year	US Dollars
1960	-12235152.74163
1961	-11416451.35104
1962	-16325591.73173
1963	-17141711.73848
1964	-17549073.32737
1965	-15914415.55956
1966	-22386990.4721
1967	-33739673.31014
1968	-10199971.15905
1969	-19299955.45479
1970	-18199334.95681
1971	-15359068.69821
1972	-20448283.44197
1973	-21338965.27961
1974	-43896192.30534
1975	-71148791.32334
1976	-32211132.43119
1977	-46268167.86246
1978	-63899745.14294
1979	-88999748.96766
1980	-126405741.01806
1981	-67231228.98891
1982	-90147343.49281
1983	-82119284.58587
1984	-77225299.66928
1985	-83263033.01184
1986	-117121885.59306
1987	-128580013.21636
1988	-92453135.5234
1989	-76001157.33666
1990	-126898519.3826
1991	-117572452.14491
1992	-134099356.30798
1993	-74035200.9764
1994	-13782304.07632
1995	-67302629.83914
1996	-41759162.89319
1997	-19223210.94784
1998	-55484193.79346
1999	-47625536.56486
2000	-44950934.46228
2001	-50468017.70985
2002	-41471290.33174
2003	2744320.67568
2004	-66655334.39539
2005	-111608645.1484
2006	-113395926.98351
2007	-158726561.28069
2008	-246769274.2949
2009	-248730942.42675
2010	-291994688.83069
2011	-230817598.46702
2012	-219855126.20192
2013	-160260971.17642
2014	-417762548.46637
2015	-347904714.09647
2016	-303630142.38252
2017	-375392590.8263