Year	current US$
1970	3365178.6539285383
1971	3780391.126049856
1972	6121304.757878305
1973	8800519.91544169
1974	10462605.79828309
1975	-2699632.7287872476
1976	2300000.5750001436
1977	3450000.8625002154
1978	-3450000.8625002154
1979	7127583.749109052
1980	30558501.55488846
1981	17434327.849686466
1982	21559822.2903328
1983	-5116237.321604882
1984	610054.9252784393
1985	5743322.826343006
1986	18030382.069047607
1987	-9577447.909734271
1988	8797132.838465288
1989	8159601.811431603
1990	6299952.731029509
1991	8148291.665384064
1992	8730672.430079235
1993	8874629.6372235
1994	9547149.682972673
1995	10311310.597904377
1996	11226676.410777537
1997	11697145.071942868
1998	0
1999	0
2000	0
2001	0
2002	0
2003	0
2004	0
2005	0
2006	0
2007	0
2008	0
2009	0
2010	0
2011	0
2012	0