Year	US Dollars
1977	-4922222.22222
1978	-3888888.88889
1979	-9592592.59259
1980	-14518518.51852
1981	-16433333.33333
1982	-18418518.51852
1983	-26500000
1984	-19629629.62963
1985	-17537037.03704
1986	-14681481.48148
1987	-22218518.51852
1988	-31703703.7037
1989	-40196296.2963
1990	-49985185.18519
1991	-35007407.40741
1992	-12329629.62963
1993	-25366666.66667
1994	-22181481.48148
1995	-53681481.48148
1996	-65659259.25926
1997	-55974493.01153
1998	-48081414.74808
1999	-59296333.37041
2000	-98846995.14329
2001	-88975271.56786
2002	-103078634.18974
2003	-90717643.5695
2004	-47700518.51852
2005	-53470851.85185
2006	-84981370.37037
2007	-113299629.62963
2008	-201565148.14815
2009	-190810407.40741
2010	-155126851.85185
2011	-112931370.37037
2012	-73219888.88889
2013	-55099925.92593
2014	44592000
2015	12780370.37037
2016	4155592.59259