Year	US Dollars
1960	45600000
1961	45200000
1962	-2600000
1963	-49400000
1964	-85500000
1965	-35200000
1966	-88500000
1967	-71700000
1968	-88000000
1969	-93900000
1970	-109400000
1971	-135400000
1972	-95600000
1973	-89100000
1974	-330500000
1975	-82800000
1976	-288500000
1977	-191200000
1978	-326000000
1979	-349400000
1980	-648000000
1981	-305000100
1982	-390999900
1983	-336000000
1984	-479000000
1985	-451492000.25702
1986	-557417518.85136
1987	-691111839.36746
1988	-468993685.07157
1989	-739429921.13565
1990	-697803877.8694
1991	-285714285.71429
1992	-778733697.60924
1993	-683384000
1994	-695206349.20635
1995	-571744186.04651
1996	-523367167.32706
1997	-758410921.34575
1998	-1580259676.66243
1999	-1403645389.26467
2000	-2018477434.66466
2001	-1722661538.64586
2002	-1990721052.72207
2003	-31059022.81655
2004	214111326.34927
2005	-1802803660.42705
2006	-2788840070.82983
2007	-3720494434.93799
2008	-6556956106.29344
2009	-4136401758.34587
2010	-5748330751.05614
2011	-6137070339.71898
2012	-5594053480.6804
2013	-3977417643.94938
2014	-3474953588.48379
2015	-3374555401.90493
2016	-2891554318.76384
2017	-2474057590.54476