Year	US Dollars
1975	-9585678.75376
1976	-8919222.77893
1977	-7958305.611
1978	-16245850.9786
1979	-19530628.21373
1980	-20055795.94625
1981	-26060675.70673
1982	-22988132.67066
1983	-30744144.14414
1984	-23352347.52084
1985	-25285983.65808
1986	-30117647.05882
1987	-27504551.18331
1988	-46942664.27412
1989	-40094557.01232
1990	-35460719.2468
1991	-49780965.60234
1992	-34742038.45297
1993	-38299855.49133
1994	-56033176.7914
1995	-77702415.61098
1996	-83497037.09717
1997	-64776414.72101
1998	-74908310.99196
1999	-39161812.09326
2000	-49739125.12964
2001	-58204475.78173
2002	-67626250.11469
2003	-75431427.92075
2004	-85455980.83785
2005	-102161688.07718
2006	-109178455.87137
2007	-137320916.76237
2008	-126575178.87205
2009	-158979047.8017
2010	-176760848.1518
2011	-191959554.60947
2012	-206636733.7306
2013	-190309839.65855
2014	-180264249.84826
2015	-207712109.51572
2016	-187955171.32409