Quarter	US Dollars, sum over component sub-periods
1981-01-01	-5899230838.49949100
1981-04-01	-4869358389.64211000
1981-07-01	-2652072044.24040000
1981-10-01	-2973751073.17101000
1982-01-01	-3885724971.40506000
1982-04-01	551277825.23108900
1982-07-01	629207086.88059010
1982-10-01	2646294300.18542000
1983-01-01	-374834038.14075100
1983-04-01	-1776564933.19130020
1983-07-01	-2556701170.75757000
1983-10-01	-573263912.39350200
1984-01-01	-2497131959.37183000
1984-04-01	-1665598177.67882010
1984-07-01	-2519240262.62359000
1984-10-01	-281303967.41218200
1985-01-01	-2082763849.42526000
1985-04-01	-1944126094.67205000
1985-07-01	-2154810682.19358970
1985-10-01	-3803297290.09867000
1986-01-01	-3145141266.44803000
1986-04-01	-2326360118.46118970
1986-07-01	-3722109175.34854000
1986-10-01	-3348922409.35742000
1987-01-01	-3575951536.89844000
1987-04-01	-2937551041.32714000
1987-07-01	-3900013741.36390000
1987-10-01	-5389718552.96679000
1988-01-01	-3214404792.94060000
1988-04-01	-2168783062.28275000
1988-07-01	-7255401163.73447000
1988-10-01	-2033473295.13420000
1989-01-01	-6025988957.15265000
1989-04-01	-6895781662.99762000
1989-07-01	-3496974042.44402030
1989-10-01	-7191540878.47979000
1990-01-01	-8431413285.60617000
1990-04-01	-8895443504.84891900
1990-07-01	-2692948341.42458000
1990-10-01	-2192996974.98884000
1991-01-01	-8932543543.56033000
1991-04-01	-1114636608.98455000
1991-07-01	-4892741123.80567000
1991-10-01	-7829823985.36191000
1992-01-01	-7129574869.48866000
1992-04-01	-4399350922.46871950
1992-07-01	-2119320790.03526000
1992-10-01	-5025121574.29077000
1993-01-01	-10381949126.62559900
1993-04-01	-8486701325.65445000
1993-07-01	-3041972909.67795040
1993-10-01	-5666067263.60048000
1994-01-01	-6240327928.13785000
1994-04-01	-4966604313.79862000
1994-07-01	2408713733.62318000
1994-10-01	-4670510107.46261000
1995-01-01	-774877642.55298900
1995-04-01	799200974.57737400
1995-07-01	668307946.12797100
1995-10-01	-2317409549.26274970
1996-01-01	-2297327341.54542000
1996-04-01	6045857017.40926000
1996-07-01	3653315049.34301000
1996-10-01	-788465302.66770200
1997-01-01	1250589215.83619000
1997-04-01	1429550364.70277000
1997-07-01	-6777016925.97256000
1997-10-01	-6629896739.96600900
1998-01-01	-7558805709.87486100
1998-04-01	1474723417.69844000
1998-07-01	-186915649.23071100
1998-10-01	688735166.37124300
1999-01-01	-2913604211.11921020
1999-04-01	1443298134.87662000
1999-07-01	4410978345.30715100
1999-10-01	3113419381.02112000
2000-01-01	-457682055.39515996
2000-04-01	7413194384.43075900
2000-07-01	4835252734.56163000
2000-10-01	2284858277.81932970
2001-01-01	1863099590.32443000
2001-04-01	6164580067.26582000
2001-07-01	541751446.94529200
2001-10-01	2325708460.64236000
2002-01-01	-781754836.73277810
2002-04-01	-705284802.52280600
2002-07-01	5159639668.46140000
2002-10-01	5626302014.61043000
2003-01-01	-1369740584.59414000
2003-04-01	4427728070.03743100
2003-07-01	5718229404.11106000
2003-10-01	2939325609.95406000
2004-01-01	5937556890.00746100
2004-04-01	8437226574.65144900
2004-07-01	2876379303.69704000
2004-10-01	7592433887.15145000
2005-01-01	3445284233.36082000
2005-04-01	3314516895.47521970
2005-07-01	6808234608.90679000
2005-10-01	6824055753.07952000
2006-01-01	6642091580.56005000
2006-04-01	5019657291.69909000
2006-07-01	7683441270.62189000
2006-10-01	617107173.35199610
2007-01-01	3545614370.19838000
2007-04-01	6389708548.04784000
2007-07-01	5758070475.23979000
2007-10-01	-2331618331.70983000
2008-01-01	4733668082.92264000
2008-04-01	81137286.34546890
2008-07-01	3411144493.88416000
2008-10-01	-9529723596.79254200
2009-01-01	-9183862655.93180000
2009-04-01	-8592677001.76159100
2009-07-01	-8437973644.49533900
2009-10-01	-15949471813.24840000
2010-01-01	-12444641251.67810000
2010-04-01	-11216740553.15190000
2010-07-01	-20619225384.97430000
2010-10-01	-14013983154.76310000
2011-01-01	-17698700468.70129800
2011-04-01	-13328572259.23899800
2011-07-01	-4759329010.26960000
2011-10-01	-13545426199.97260000
2012-01-01	-16801398701.20610000
2012-04-01	-13539632069.66450000
2012-07-01	-19211795378.95400200
2012-10-01	-13201192130.07260100
2013-01-01	-12122432516.20420000
2013-04-01	-15089471984.75300000
2013-07-01	-14575574840.20690000
2013-10-01	-15067724794.12270000
2014-01-01	-11431341790.65400000
2014-04-01	-14081708711.06129800
2014-07-01	-7627050066.80207100
2014-10-01	-9209233871.60793900
2015-01-01	-19706837983.45170000
2015-04-01	-16590465343.31269800
2015-07-01	-12405170486.26669900
2015-10-01	-9663491890.44534100
2016-01-01	-15835452172.61030000
2016-04-01	-15410786766.02470000
2016-07-01	-11484738310.55770000
2016-10-01	-8691340674.33542000
2017-01-01	-10937097373.07020000
2017-04-01	-8832639485.61372000
2017-07-01	-13344026377.43590000
2017-10-01	-6992518496.03024000
2018-01-01	-10844500776.09430100
2018-04-01	-8027561782.63560000