Year	US Dollars
1960	-56361446.54492
1961	-122864216.36276
1962	-105555659.26007
1963	-94027392.29671
1964	25315375.15998
1965	-24169052.94961
1966	-72926056.60504
1967	-105970523.68425
1968	228174840.7009
1969	263127715.35391
1970	-79799521.20287
1971	-370470103.03434
1972	131295346.22507
1973	-86544798.64026
1974	-728017762.69473
1975	-1901318180.94855
1976	-3003940254.74205
1977	-3777589931.43609
1978	168246761.91748
1979	1237732272.26951
1980	3882207644.96275
1981	4581061068.03729
1982	3168267740.93585
1983	4797982566.74524
1984	5426453470.56301
1985	4722933047.96911
1986	-2663529284.48754
1987	-2081781076.06679
1988	-595059076.26208
1989	3569700919.69006
1990	7486301260.44379
1991	9420783908.43604
1992	8642529567.94593
1993	7557124934.80498
1994	7559368623.89481
1995	9182188407.62723
1996	14331297094.4836
1997	12992337489.7503
1998	2764840757.57777
1999	11685685711.355
2000	28791951646.2542
2001	28957927866.8105
2002	25683759613.2168
2003	29082229315.5561
2004	34844232138.61859
2005	49395265812.9608
2006	58518235541.7648
2007	53776549465.1722
2008	78323936170.2128
2009	44089658572.26909
2010	48321466979.18099
2011	64151684555.3342
2012	66495917490.3309
2013	56456170212.76601
2014	44938428987.0404
2015	21751782577.245
2016	3204047619.04762
2017	9653798105.98428