Year	US Dollars
1960	-1001551225.35566
1961	-264311281.79643
1962	-159731641.53279
1963	-340416771.42174
1964	-1584944452.78591
1965	-886780127.18808
1966	-156901716.38124
1967	-1154804655.89951
1968	-834236538.97955
1969	463230179.80662
1970	1050871610.27118
1971	1946427841.32392
1972	-192878621.37862
1973	-4406353013.22881
1974	-9778278167.36793
1975	-4050603761.06195
1976	-2568104402.51572
1977	1798003663.00366
1978	4318569127.51678
1979	1562235493.43499
1980	12078398559.1448
1981	14959433279.7428
1982	9602745632.42488
1983	4619803395.4828
1984	-262411412.60974
1985	5312487679.67146
1986	-3528257402.52125
1987	-6814172740.6439
1988	-29137267164.71009
1989	-33133521269.6335
1990	-19829497869.3182
1991	-4220005114.63845
1992	-8263540540.54054
1993	-3760760947.81044
1994	-240315733.08846
1995	3656304244.91084
1996	2379095163.80655
1997	6281925343.81139
1998	-13025836369.6588
1999	-25869600388.28671
2000	-30378272053.2607
2001	-37371527277.9617
2002	-49433453237.4101
2003	-48968163265.3061
2004	-62984254851.70269
2005	-64750909090.9091
2006	-64872125114.99541
2007	-76136454581.83272
2008	-82818014705.88229
2009	-52115594329.33479
2010	-63611424379.38451
2011	-40329038830.0528
2012	-52703828605.55621
2013	-55290260550.2929
2014	-60604252896.4583
2015	-49454164824.1852
2016	-54921829855.1074
2017	-36833853669.725