Year	Dollars
1970-01-01	-326879999.67312050
1971-01-01	-369833922.11301303
1972-01-01	-2297677870.13838010
1973-01-01	3275007545.03144980
1974-01-01	7053912261.68361000
1975-01-01	-1931068623.02664280
1976-01-01	5710779836.37634180
1977-01-01	4073454750.64410350
1978-01-01	-2857707329.61659000
1979-01-01	-2159786585.75796990
1980-01-01	12030100307.00775900
1981-01-01	8259413910.19779970
1982-01-01	2513417513.25922010
1983-01-01	3915582016.58625980
1984-01-01	2848094365.50196980
1985-01-01	116829309.10967800
1986-01-01	1971369751.65225700
1987-01-01	8909887115.75877000
1988-01-01	16710227537.06115300
1989-01-01	24737843238.96610600
1990-01-01	42638537264.35690300
1991-01-01	24211643173.51400000
1992-01-01	11549921043.29213300
1993-01-01	5259811474.37631990
1994-01-01	-14207039663.00519900
1995-01-01	-2889112660.98618980
1996-01-01	-7982231860.00716020
1997-01-01	-6878328130.68647960
1998-01-01	-18074036128.68370100
1999-01-01	-17414743002.36119800
2000-01-01	7504259430.29677010
2001-01-01	-3569709511.10131980
2002-01-01	11223541919.23990100
2003-01-01	20437433683.49160000
2004-01-01	8347020423.08191970
2005-01-01	25285904308.18960200
2006-01-01	30939163013.94929900
2007-01-01	37738666055.32790400
2008-01-01	53827462282.40570100