Year	US Dollars
1960	14300000
1961	-32100000
1962	-68700000
1963	-36300000
1964	14500000
1965	29700000
1966	35800000
1967	57200000
1968	97700000
1969	130299800
1970	81100000
1971	77500000
1972	90600100
1973	88999800
1974	75099900
1975	31800100
1976	20900100
1977	-62899700
1978	-48600100
1979	-33799900
1980	-500200
1981	27100200
1982	-20000000
1983	-19000000
1984	45000000
1985	62000200
1986	95000100
1997	-187000000
1998	-102700000
1999	-119800000
2000	-40000000
2001	13311900
2002	62872500
2003	806400
2004	-737000000
2005	-837000000
2006	-678000000
2007	-1193000000
2008	-937900000
2009	-920453900
2010	-950084200
2011	-1122778200
2012	-977800000
2013	-1203600000
2014	-1612500000
2015	-1771200000
2016	-1656800000