Year	US Dollars
1960	-19800000
1961	-16600000
1962	-18700000
1963	-20800000
1964	-35100000
1965	-37600000
1966	-2700000
1967	-48000000
1968	-27100000
1969	6400000
1970	15100000
1971	-28000000
1972	7800000
1973	17400000
1974	-103000000
1975	-66000000
1976	-262400000
1977	-98700100
1978	-351300100
1979	-310800000
1980	-215300000
1981	-560499900
1982	-340000000
1983	-140999900
1984	-203500000
1985	-100695565.21739
1986	105570776.25571
1987	-456599960
1988	-457366450.38168
1989	-434552556.81818
1990	-291809710.64247
1991	-340034600.01193
1992	-963717943.75894
1993	-954501898.71171
1994	-951801363.19377
1995	-904435170.20617
1996	-748115757.15787
1997	-1003310355.06374
1998	-1567257913.17403
1999	-1529708068.73113
2000	-1688836948.68096
2001	-2455610630.39218
2002	-2791131418.12417
2003	-3158847836.49003
2004	-3625256012.08079
2005	-4337299362.05609
2006	-5125625917.44929
2007	-5720075234.90545
2008	-5748753290.38744
2009	-3454634564.72462
2010	-4342057907.34329
2011	-5114958768.97783
2012	-5666360294.11765
2013	-5982206496.28347
2014	-6107754714.05292
2015	-5729754533.10341
2016	-5438624192.42359
2017	-6098926223.81905