Year	US Dollars
1960	-147659410.06336
1961	-31678641.74808
1962	-269239903.39524
1963	-1257336656.04978
1964	66221153.89528
1965	1469777785.02269
1966	1245488591.83141
1967	782591646.54941
1968	1730255958.08441
1969	1259807943.82704
1970	260450123.91574
1971	954193196.00499
1972	1170285192.56308
1973	-3249447359.68117
1974	-7487490919.91664
1975	150103499.40688
1976	-2472823214.70109
1977	2451446126.83783
1978	6587541638.14739
1979	4180763924.49313
1980	-12397612254.1262
1981	-8392678589.67808
1982	-5408677165.35434
1983	2117909357.47068
1984	-1857543861.58254
1985	-1852883378.96765
1986	7979286790.49227
1987	3280697191.51479
1988	415707378.75632
1989	-163348433.53091
1990	2349450549.45055
1991	2433044482.59716
1992	612663786.3315
1993	32376115786.88319
1994	36146550072.04609
1995	43014263639.60541
1996	59464801104.2791
1997	46077989995.45249
1998	38437493029.9989
1999	22172064777.3279
2000	9602819237.1476
2001	14590335570.4698
2002	9447487295.31338
2003	7107900677.2009
2004	10469083685.1254
2005	-2047009078.47283
2006	-16247020449.1281
2007	-7914453873.52861
2008	-18860993115.5705
2009	-14333009169.2137
2010	-41846117793.0309
2011	-35744508531.7617
2012	20476334343.5819
2013	48118911477.79859
2014	61394471189.45071
2015	53702233394.1646
2016	60467672449.783
2017	59562039221.09739