Year	US Dollars
1960	-24165019.60506
1961	-17743179.00305
1962	-13203064.61557
1963	-23323168.07266
1964	-18947354.17513
1965	-59381116.98113
1966	-36966052.83019
1967	-43245283.01887
1968	-34913207.54717
1969	-44316981.13208
1970	-66671698.11321
1971	-111895937.09439
1972	-79698568.19895
1973	-93277968.34567
1974	-246822156.36822
1975	-166394375.72929
1976	-144795810.96849
1977	-167934690.7818
1978	-276581026.83781
1979	-414469078.1797
1980	-499626557.75963
1981	-128771813.0982
1982	76087968.19821
1983	-37148673.04875
1984	-1211128.00257
1985	-76751918.81188
1986	3913688.17204
1987	-236816168.55186
1988	-134907767.5155
1989	-262361676.7353
1990	-448862419.70723
1991	-333004982.43894
1992	-473825389.59142
1993	-697430641.9632
1994	-653115523.53236
1995	-407096810.10967
1996	-471011987.8677
1997	-554419604.47119
1998	-562743108.20794
1999	-345378745.44945
2000	-99732307.99182
2001	26262656.97692
2002	-325752876.43822
2003	-342717526.29349
2004	-156553800.45434
2005	-459745740.09699
2006	-723753759.52128
2007	-1422819362.83989
2008	-2707040018.96489
2009	-152101396.50577
2010	-697915075.46557
2011	-1579738632.87138
2012	-1768488011.27059
2013	-1468643999.76149
2014	-1282418520.9018
2015	-475683195.78245
2016	471136687.74463
2017	417461397.93209