Year	Dollars
1970-01-01	-1511998792.51776360
1971-01-01	1237764480.42419580
1972-01-01	496229886.21961021
1973-01-01	200782647.54059601
1974-01-01	3260383410.09289880
1975-01-01	104623287.97560358
1976-01-01	-6147320587.87454800
1977-01-01	6014797849.21649550
1978-01-01	-8185555958.90463540
1979-01-01	1036205300.82269290
1980-01-01	-7493529030.58732600
1981-01-01	-19508720822.49101300
1982-01-01	-6847838711.02046200
1983-01-01	-8580467289.08221440
1984-01-01	-12493887661.23821300
1985-01-01	-1787677822.61450200
1986-01-01	-1182187642.80552670
1987-01-01	36947397186.27858000
1988-01-01	35756793914.48946400
1989-01-01	22717371824.31137100
1990-01-01	26495280623.49465900
1991-01-01	14829868943.47913000
1992-01-01	1979850875.73387150
1993-01-01	22667734958.73144500
1994-01-01	4727804212.48043820
1995-01-01	3669175821.07057190
1996-01-01	3987421111.91796870
1997-01-01	-18466961294.00891100
1998-01-01	16321335101.79530300
1999-01-01	46649913345.13014200
2000-01-01	39705498359.77105700
2001-01-01	34316184293.90997300
2002-01-01	36263184416.33451800
2003-01-01	34809137729.55377200
2004-01-01	53823030513.47910300
2005-01-01	52618295600.19819600
2006-01-01	77622483089.15260300
2007-01-01	52513435413.12010200
2008-01-01	41007074408.76170300