Year	US Dollars
1960	0
1961	-105052154.86841
1962	-134006459.03708
1963	-137718549.31512
1964	-169085712.16452
1965	-83769633.50785
1966	-88038911.45552
1967	125271857.32927
1968	146258894.67716
1969	281442825.25929
1970	292796868.06047
1971	188058850.17363
1972	453610805.82834
1973	506946468.47372
1974	449956276.33357
1975	561881990.59815
1976	1375183493.72044
1977	1027027027.02703
1978	185750581.80498
1979	291242728.92638
1980	-149112758.98796
1981	-471436494.731
1982	182210580.07545
1983	539833727.90838
1984	2681760040.93118
1985	3583970837.39796
1986	3739315417.83604
1987	5271661772.43759
1988	5329490135.79297
1989	7885357504.58339
1990	6568076202.21315
1991	6048872760.96356
1992	5422318683.30622
1993	8119344330.11014
1994	1571606024.53289
1995	-6481941104.99237
1996	-2371384611.40633
1997	-5954327637.20438
1998	905452338.83775
1999	8561650016.11344
2000	7568667214.29305
2001	7945709596.34819
2002	13569221300.4398
2003	14681640725.3301
2004	14729840780.6882
2005	22181734020.8041
2006	21601869255.1301
2007	22588766118.9017
2008	22308522114.3474
2009	16850924946.464
2010	13431627451.9898
2011	9568088386.43371
2012	2969289876.74688
2013	1654461062.4033
2014	597361395.90668
2015	7391960576.89827
2016	7348337477.2941
2017	3107452651.0291