Year	US Dollars
1960	31564300.5643
1961	-103953535.45329
1962	-100622785.89394
1963	81096648.30119
1964	-16141836.73469
1965	24552429.66752
1966	136761768.17088
1967	-43581313.55608
1968	-196437659.03308
1969	-256351567.8645
1970	35546828.71507
1971	2954117.88485
1972	16929346.19764
1973	491837248.19798
1974	-321307031.62981
1975	-907297286.11046
1976	-1012459175.03327
1977	-602609823.3101
1978	-969480572.37503
1979	-1395982433.31165
1980	-1589583832.57449
1981	-1189792017.41838
1982	-2154683840.74942
1983	-2238969827.31469
1984	-329486726.51165
1985	652217140.58461
1986	1180925845.07768
1987	139685040.13575
1988	550754454.91048
1989	-918124646.33546
1990	-2555809218.23903
1991	-1358184186.96731
1992	-2595002449.77952
1993	-4592605429.96102
1994	-4042555607.71013
1995	-5799124226.11455
1996	-7279569113.16501
1997	-8512217219.13629
1998	-6595234854.37607
1999	-3262409585.81699
2000	-1613454193.06662
2001	-5227945772.52386
2002	-7274240196.4204
2003	-6322670531.13004
2004	-5022881420.20239
2005	-5776729110.20141
2006	-2181109538.66661
2007	-146092492.91416
2008	-4282039575.12189
2009	-1894904997.30493
2010	-3618393582.75493
2011	-8150348797.47698
2012	-8156376690.78922
2013	-11444125926.4669
2014	-10376470512.5779
2015	-17269471698.4449
2016	-27346267635.9425
2017	-29963957312.65761