Year	US Dollars
1967	-458608287.13781
1968	-333117338.98478
1969	-484662576.68712
1970	-273972602.73973
1971	-207411919.10664
1972	-261686746.98795
1973	93253012.04819
1974	1955180722.89157
1975	174939759.03615
1976	500000000
1977	1562891566.26506
1978	524601303.93351
1979	3328732398.36736
1980	6011898210.03492
1981	1781847509.496
1982	-3532551269.04326
1983	-865978918.61865
1984	3834824867.63025
1985	2419636682.03251
1986	-14658182.96307
1987	1654773878.63845
1988	2384647396.59358
1989	2921595781.39306
1990	1825255936.88515
1991	2172617938.21619
1992	4080850476.86608
1993	4718460796.394
1994	2026749971.07486
1995	-2696966881.75012
1996	-1399777995.98685
1997	-594112855.45762
1998	9306014192.93817
1999	11318192667.4627
2000	17356482696.0358
2001	13270680431.7646
2002	12318361643.8171
2003	17229518703.4996
2004	11999661267.3738
2005	11853826371.2882
2006	19731671140.9269
2007	17471008751.7777
2008	5383772872.48198
2009	15141253737.0894
2010	14322535402.8988
2011	22098243949.287
2012	-3617699099.05467
2013	-7210947471.84081
2014	-6665132936.4105
2015	3294646505.24147
2016	7486105476.16245
2017	12241254068.7234