Year	US Dollars
1960	-13999883.33431
1961	-1691652.56956
1962	22924808.95993
1963	29516420.69649
1964	6999941.66715
1965	-5117647.05882
1966	-11823529.41176
1967	-5882352.94118
1968	7100000
1969	9500000
1970	-1450000
1971	10500000
1972	-3714285.71429
1973	-51285714.28571
1974	8363636.36364
1975	-125000
1976	-113280000
1977	-70000000
1978	-80000
1979	-49960000
1980	-74520040
1981	-133392892.85714
1982	-83400000
1983	-91500000
1984	-31500000
1985	-62558139.53488
1986	-34860465.11628
1987	-39693877.55102
1988	-17800020
1989	-27316180.14706
1990	-68025329.11392
1991	-74500011.62791
1992	-92992591.52678
1993	-87773033.02611
1994	-70194955.89299
1995	-67794800
1996	-42993879.62963
1997	-73539424.58269
1998	-85943424.41818
1999	-55874762.07598
2000	-104111191.14181
2001	-114367738.6601
2002	-91668336.08685
2003	-74022602.839
2004	-77525362.37913
2005	-285273822.63915
2006	-398130160.45393
2007	-464381183.38475
2008	-634503295.87548
2009	-514057367.00172
2010	-630193708.57187
2011	-776002058.64693
2012	-809899999.65746
2013	-807099999.90263
2014	-869099999.90312
2015	-594100000
2016	-302700000
2017	-493700000