Year	US Dollars
1960	37777799.54785
1961	-38069179.10448
1962	-188604.88031
1963	-17774811.11111
1964	-41462555.55556
1965	58952380.95238
1966	-161562962.96296
1967	29565648.97599
1968	-77333857.11743
1969	-73439673.93501
1970	-108435117.81482
1971	-301003797.66521
1972	-45731614.73839
1973	84847465.39282
1974	-115111466.25124
1975	226335736.80381
1976	489984072.63294
1977	707017389.90923
1978	665046865.32805
1979	493556626.23419
1980	211513679.63738
1981	-1303010477.30559
1982	-1654032419.03823
1983	-1077894025.2988
1984	-228134899.19905
1985	449716834.24483
1986	2391414016.62096
1987	1467395338.21613
1988	952624924.08246
1989	1654613520.46584
1990	2313543192.37049
1991	3066108773.71456
1992	961623286.13439
1993	-1300418946.85915
1994	-4837512137.65192
1995	-5947981744.62857
1996	-5484866733.01492
1997	-6307822629.07108
1998	-5802491966.42256
1999	468747716.54879
2000	-835856910.68531
2001	-3070668019.8709
2002	-3282237494.35379
2003	-3186689303.7727
2004	-2718389459.61796
2005	-2835187451.13287
2006	-4713402351.42406
2007	-6744000048.50137
2008	-6033913613.24194
2009	-5187058680.11296
2010	-5249214987.95726
2011	-4013766276.8422
2012	-6574671354.08345
2013	-9710585801.3759
2014	-20599156451.1802
2015	-23683742061.88169
2016	-19467135183.2509
2017	-16435316529.0981