Year	current US$
1980	-21900000
1981	-19100000
1982	-17100000
1983	-19800000
1984	-10700000
1985	6099999.99999998
1986	10400000
1987	16300000
1988	12100000
1989	9900000.00000003
1990	6079204.18848165
1991	-14500556.097561
1992	-15038628.1929991
1993	-40602718.9781021
1994	-5247144.08973249
2006	-269375000
2007	168193992.1875
2008	-107214250
2009	232165796.875
2010	314232523.4375
2011	146770408.163266
2012	339502570.811205
2013	508336311.634899
2014	545048444.773868
2015	375920280.093451
2016	-50674149.5536295
2017	-224773776.564632