Year	US Dollars
1975	-103892335.15564
1976	-74189538.52368
1977	-146595405.10318
1978	-198515316.92102
1979	-245956766.46707
1980	-383656053.06799
1981	-272852022.3152
1982	-287575955.61036
1983	-293066073.41491
1984	-283460817.54736
1985	-245304030.71017
1986	-104639774.0113
1987	-110507551.76614
1988	-232172647.42785
1989	-383980236.68639
1990	-313499103.71319
1991	-577516161.61616
1992	-772991786.17992
1993	-28577267.37338
1994	-29493690.47619
1995	-84993531.6947
1996	-43036386.44919
1997	-133751425.31357
1998	257466063.34841
1999	280474649.40669
2000	247596606.97455
2001	482604735.88342
2002	135961538.46154
2003	221970554.92639
2004	-21875000
2005	-99738838.45293
2006	-598795634.17388
2007	-1145359978.10019
2008	-3553683902.15322
2009	-1387329813.83718
2010	-1857218543.04636
2011	-804698359.74424
2012	-370936656.81614
2013	439591078.06691
2014	478439697.49237
2015	158034823.1119
2016	-156526548.67257
2017	-860378634.21231