Year	US Dollars
1965	46095238.09524
1966	78666666.66667
1967	72571428.57143
1968	122476190.47619
1969	122095238.09524
1970	-39619047.61905
1971	-5545993.4978
1972	13623978.20163
1973	-9724857.68501
1974	112027491.40894
1975	-81034054.18842
1976	-222248134.32836
1977	-430769230.76923
1978	-463959634.79097
1979	-214760147.60148
1980	-469004692.51667
1981	-713649250.70879
1982	-856441510.07279
1983	-697701826.75309
1984	-938208032.95572
1985	-507130017.97483
1986	-642065491.18388
1987	-95933389.64643
1988	36372114.71205
1989	-334983672.1795
1990	-866136363.63636
1991	-647826086.95652
1992	-1073948439.62008
1993	-1098635050.31384
1994	-459568999.60459
1995	-704240245.32092
1996	-294123690.15821
1997	-471471199.92766
1998	-640994116.0973
1999	-446720620.46872
2000	-722039833.66163
2001	-864669493.29256
2002	-873039319.12499
2003	-939774932.09158
2004	-781453231.63388
2005	-124788037.61369
2006	-647633358.37716
2007	-740518183.23708
2008	-1367015664.31296
2009	-1174109457.15767
2010	-2114643006.84644
2011	-3306151441.96619
2012	-4149817529.93149
2013	-4308980119.40666
2014	-5227955469.16416
2015	-4726855628.05873
2016	-4485986964.61825
2017	-4948334297.75978