Year	US Dollars
1960	19792411.0229
1961	20315323.20178
1962	18760956.01107
1963	-3433906.87317
1964	-7094804.98492
1965	5388402.63787
1966	4263699.21002
1967	-12666798.3735
1968	-55188904.55707
1969	-59946587.67521
1970	-30204644.23156
1971	-56237759.05054
1972	-35689975.62172
1973	-113743361.72412
1974	-68374291.81898
1975	-80500003.03295
1976	-130633475.13397
1977	-143864360.79171
1978	-275395597.01297
1979	-248299935.22049
1980	-506499444.33821
1981	-628616851.56119
1982	-443226438.44625
1983	-460466165.966
1984	-411477842.08367
1985	-337641871.24246
1986	-339006641.23828
1987	-388538367.7063
1988	-364044503.20667
1989	-316637529.49375
1990	-387306768.99842
1991	-439549688.43371
1992	-503974362.25829
1993	-517241895.64582
1994	-283547599.65108
1995	-315219581.99205
1996	-292834204.27702
1997	-291433816.3008
1998	-330277829.47692
1999	-359964794.49134
2000	-434813630.73462
2001	-440837691.33545
2002	-555594771.90575
2003	-830866742.49824
2004	-1014361950.22079
2005	-1341470697.46967
2006	-1635079723.25351
2007	-2527631790.89392
2008	-3534626162.98621
2009	-2163239948.17442
2010	-1992621209.97593
2011	-2635593087.6456
2012	-2986580581.30647
2013	-3091648565.47004
2014	-2935038632.1739
2015	-2293841595.06298
2016	-2197066870.43008
2017	-2573859593.78424