Year	US Dollars
1960	-44385302.13939
1961	-34249085.45379
1962	-34217890.7752
1963	-54261839.98805
1964	-53164814.63398
1965	-56584742.6849
1966	-53145783.0646
1967	-38160008.14475
1968	-51994464.26469
1969	-52843618.23462
1970	-26965836.57569
1971	-78939361.32416
1972	-54472051.23973
1973	-76551270.06791
1974	-89758416.72595
1975	-114851459.23223
1976	-51512445.96939
1977	-85015374.76558
1978	-184382967.38905
1979	-547650299.17645
1980	-662712925.60414
1981	-406614371.22387
1982	-332918780.13864
1983	-244531486.29639
1984	-135976235.7093
1985	-236240624.77594
1986	-110727957.42775
1987	-152435269.8557
1988	-166081973.41118
1989	-95479431.84564
1990	-352060299.52441
1991	-227615301.6302
1992	-250530933.36173
1993	-313414396.35904
1994	-225260294.76392
1995	-239424819.04496
1996	-220200103.21941
1997	-286989918.6507
1998	-290005519.44505
1999	-287890767.81075
2000	-284070386.01217
2001	-145562118.06522
2002	-288700255.38806
2003	-491992100.15249
2004	-647933027.97035
2005	-873833477.33214
2006	-884753534.01437
2007	-1596607717.03923
2008	-2858458479.85695
2009	-2501656523.0509
2010	-1577891815.59367
2011	-1542357418.76706
2012	-1042187173.3635
2013	-921008986.8922
2014	-467544573.84814
2015	-337810538.9032
2016	-226286728.90295
2017	-415914828.68063