Year	US Dollars
1967	-34552718.30306
1968	-27063629.02304
1969	-26542482.59159
1970	-20622058.14624
1971	-29245919.7998
1972	-46423485.76108
1973	-71335893.79835
1974	-151638085.17241
1975	-162846010.66945
1976	-94161768.65083
1977	-71637998.98811
1978	-222905770.68891
1979	-243040682.28144
1980	-253692263.71121
1981	-238588459.56394
1982	-205108666.51065
1983	-209675061.80032
1984	-219641900.4446
1985	-357817126.93901
1986	-379081037.89164
1987	-312194920.6852
1988	-383171696.18618
1989	-287892195.90838
1990	-409715100.88708
1991	-409830457.88671
1992	-516422344.77985
1993	-409738432.97102
1994	-365337424.19688
1995	-463396653.1797
1996	-410153041.99531
1997	-253104582.83405
1998	-224004498.6726
1999	-327590214.11595
2000	-309161313.65609
2001	-262529117.63843
2002	-64351524.45909
2003	-333453110.91546
2004	-433230333.33535
2005	-508819395.9028
2006	-284187824.55434
2007	-679800895.86844
2008	-1292222311.79488
2009	-722799454.3679
2010	-1314656242.87015
2011	-1098103890.06542
2012	-607889605.07679
2013	-1985038721.15618
2014	-2227094443.12976
2015	-2037187182.33763
2016	-2327362044.06617
2017	-2900659102.48953