Year	US Dollars
1960	2800000
1961	2000000
1962	-4400000
1963	-8600002
1964	-800000
1965	-7200000
1966	-10857145.14286
1967	-7820001
1968	-11020002
1969	-12600000
1970	-8200002
1971	-14843446.76869
1972	-19651483.63281
1973	-5362120.77882
1974	-28286131.74013
1975	-48766015.04379
1976	-30717772.90096
1977	-25329624.92352
1978	-81687011.31661
1979	-18917848.16595
1980	-149888638.5581
1981	-167851654.93923
1982	-177283471.95358
1983	-135794269.97968
1984	-111639986.47151
1985	-156205707.55802
1986	-147218495.30031
1987	-252229411.80912
1988	-263114530.58758
1989	-268140588.15456
1990	-215616678.27502
1991	-205282333.92616
1992	-257577445.93418
1993	-302205659.43551
1994	-440805352.72727
1995	-267381309.87485
1996	-278779978.48902
1997	-330924974.91127
1998	-350608590.51833
1999	-332393149.82636
2000	-321979176.85623
2001	-264769166.20823
2002	-279519846.84617
2003	-278523308.99926
2004	-284899221.92263
2005	-355868873.5451
2006	-403615942.46111
2007	-365315558.68399
2008	-839867238.41531
2009	-965080678.53016
2010	-1036385517.72852
2011	-1089647466.25266
2012	-1393467588.46033
2013	-1359727285.52076
2014	-1458095112.83593
2015	-1991747010.40299
2016	-1540803669.47538
2017	-1327672286.22402