Year	US Dollars
1960	176905941.55866
1961	-87037891.14142
1962	-292991012.20872
1963	-585174142.74915
1964	-548936070.9834
1965	-1226165596.66756
1966	-1339379066.83586
1967	-1054637618.54501
1968	-639518864.94099
1969	-647133296.71821
1970	-601937247.44474
1971	103633772.45509
1972	-240919751.48848
1973	-1072934608.79497
1974	-5066588116.52726
1975	-4851814492.75362
1976	-5726592141.25839
1977	-3383823001.09529
1978	209060112.84722
1979	-708928358.94893
1980	-6669101879.78649
1981	-5448160569.47198
1982	-4789436771.16462
1983	-2525630278.42227
1984	2078254812.66818
1985	1814572504.89237
1986	2937147083.28383
1987	-2367733189.59709
1988	-7438000285.67348
1989	-16771217287.4209
1990	-21631477962.7816
1991	-22095266293.0344
1992	-21909434097.1884
1993	-7359183684.14172
1994	-4647930195.00683
1995	-5924739791.83347
1996	-587153553.1328
1997	1267045454.54545
1998	-3071611538.03319
1999	-12306626891.1144
2000	-17894785332.59629
2001	-14708724832.2148
2002	-14304536043.6665
2003	-20102708803.6117
2004	-41227961261.485
2005	-57858475314.01569
2006	-74802408731.65219
2007	-88627155762.38708
2008	-83793760070.30908
2009	-17245068074.4651
2010	-18682331380.1718
2011	-3658831970.42728
2012	19623699812.3518
2013	44334585310.50769
2014	33452264544.51139
2015	27186553944.2755
2016	37330407808.9465
2017	34969675663.11539