Year	US Dollars
1960	-876772602.11
1961	-648432310.635
1962	-784655183.14864
1963	-786947216.78708
1964	-1105417530.90564
1965	-1132545617.63852
1966	-1158463558.07356
1967	-957679794.77387
1968	-480213233.47093
1969	-186255320.57376
1970	-61335576.22863
1971	-226772048.46039
1972	225332290.43918
1973	-441252575.83403
1974	-1183836693.82487
1975	-985748691.19926
1976	581685933.72359
1977	138463350.87959
1978	-379865809.43699
1979	-2173115805.88076
1980	-5779848993.11271
1981	-5094092900.93982
1982	-4331428246.29561
1983	-4396351789.08787
1984	-3061684965.79332
1985	-5553769972.2696
1986	-4545953988.26786
1987	-3839294881.8878
1988	-4212895874.99223
1989	-3367750544.96315
1990	-4495902634.82007
1991	-12311597.65778
1992	-2164501407.27965
1993	29902243.04416
1994	-1006202676.01894
1995	-4264019272.5281
1996	-4569080394.02238
1997	-5163952054.79476
1998	-7017678788.32966
1999	-8782465773.58393
2000	-4273861399.56923
2001	-4282994573.94535
2002	-5079929146.81413
2003	-4280141237.32965
2004	-12711752198.6622
2005	-22945084012.6157
2006	-30035728489.9352
2007	-49767838590.2928
2008	-62059901876.01751
2009	-73424483482.43918
2010	-74680288491.85948
2011	-119283202737.81099
2012	-122906094752.53198
2013	-55375054071.15309
2014	-60893641789.0964
2015	-48309310833.0785
2016	-39101616412.12129
2017	-75515422246.6066