Year	current US$
1977	-16029629.6296296
1978	-11088888.8888889
1979	-23662962.962963
1980	-30166666.6666667
1981	-23259259.2592593
1982	-25474074.0740741
1983	-22862962.962963
1984	-14329629.6296296
1985	-6459259.25925926
1986	-9485185.18518521
1987	-22711111.1111111
1988	-11781481.4814815
1989	-46725925.9259259
1990	-22100000
1991	-41507407.4074074
1992	-23722222.2222222
1993	-43440740.7407407
1994	-57814814.8148148
1995	-38200000
1996	-37051851.8518519
1997	-80603703.7037037
1998	-91600000
1999	-62785185.1851852
2000	-21055555.5555555
2001	-33515555.5555556
2002	-36506074.0740741
2003	-68543370.3703704
2004	-87677592.5925926
2005	-90648925.9259259
2006	-113858851.851852
2007	-189895481.481481
2008	-220648888.888889
2009	-195735925.925926
2010	-206000000
2011	-193800000
2012	-213800000
2013	-233269391.389308
2014	-191290125.56398
2015	-124068982.819021
2016	-155851335.649488
2017	-157070148.010828