Year	US Dollars
1960	-8100000
1961	-10450000
1962	-12400000
1963	-12700000
1964	-32850000
1965	-34100000
1966	-1400000
1967	2650000
1968	13500000
1969	19000000
1970	14550000
1971	23700000
1972	16850000
1973	12500000
1974	4500000
1975	-26500000
1976	-1000000
1977	-44000000
1978	-17000000
1979	-2500000
1980	-43000000
1981	-124000000
1982	-141000000
1983	-129800000
1984	-46850000
1985	-27600000
1986	-950000
1987	53350000
1988	57200000
1989	53580000
1990	-9310000
1991	-44610000
1992	-20666666.66667
1993	-7847058.82353
1994	-20959701.49254
1995	-30237330.31674
1996	-63780548.62843
1997	-89255750
1998	-202004250
1999	-56687325.5814
2000	-120176742.42424
2001	-235571559.63303
2002	-224283914.89362
2003	-328095693.96386
2004	-326642136.06437
2005	-264298495.4424
2006	442535335.49586
2007	201821493.62477
2008	164298724.95446
2009	12750455.37341
2010	617396372.11335
2011	606113708.69033
2012	282121212.12121
2013	-131212121.21212
2014	-416969696.9697
2015	-845552726.31487
2016	-148669042.80256
2017	275518517.0346