Year	US Dollars
1976	-30500007.86666
1977	-34668547.74642
1978	-42664426.06095
1979	-62557697.02456
1980	-77634055.34737
1981	-76116818.50158
1982	-82599703.68951
1983	-67502835.19226
1984	-61944646.4526
1985	-70788394.15068
1986	-87150907.63092
1987	-91039828.81032
1988	-127296278.1791
1989	-130477093.25282
1990	-129714628.3423
1991	-123297033.63394
1992	-143541654.46416
1993	-187172826.40162
1994	-155601685.19324
1995	-179697389.69739
1996	-239130163.58478
1997	-227186001.63142
1998	-260704471.59879
1999	-288613757.60412
2000	-39544558.7875
2001	-123261254.80154
2002	-52439160.58394
2003	16696539.33749
2004	-63395509.09091
2005	-199498309.09091
2006	-164282968.27726
2007	-12273626.718
2008	-103820126.46449
2009	-76557292.853
2010	-138536444.09089
2011	-166470099.34577
2012	-188805735.55166
2013	-104015449.93905
2014	-214802761.43406