Quarter	US Dollars, sum over component sub-periods
1991-01-01	-3226282583.13190030
1991-04-01	-7383434986.15704000
1991-07-01	-2162385686.70553000
1991-10-01	11512825857.93600000
1992-01-01	-14692578549.22710000
1992-04-01	-14239527962.58440000
1992-07-01	-34937841331.51250000
1992-10-01	24939577620.51239800
1993-01-01	23307977749.45970000
1993-04-01	19413253587.54090000
1993-07-01	-3829893426.98749970
1993-10-01	50263215380.04400000
1994-01-01	-36624453781.46390000
1994-04-01	-27130064788.47810000
1994-07-01	-14494693523.81359900
1994-10-01	533431219.22777903
1995-01-01	-20832873962.11110300
1995-04-01	4360764066.75261000
1995-07-01	-9407265548.78048900
1995-10-01	-11792672749.61960000
1996-01-01	-15956962362.95540000
1996-04-01	-6491160608.44996000
1996-07-01	2666328685.24123000
1996-10-01	12302368774.91019800
1997-01-01	-26252432391.19510000
1997-04-01	-25062389913.02319700
1997-07-01	4495315496.07344000
1997-10-01	3656467854.83931970
1998-01-01	-29167008469.87020000
1998-04-01	-15814526615.31309900
1998-07-01	2525018572.96807000
1998-10-01	-48766964451.24150000
1999-01-01	-8845335361.58409000
1999-04-01	-28361062083.63730000
1999-07-01	11501788877.40590000
1999-10-01	-21316072062.22720000
2000-01-01	-62335872853.81230000
2000-04-01	14211810559.79260000
2000-07-01	18477615438.15260000
2000-10-01	-18147075608.82940000
2001-01-01	-50266871657.92509500
2001-04-01	2680843239.73469000
2001-07-01	42891426950.11349500
2001-10-01	30659552565.55480200
2002-01-01	4593537722.73157000
2002-04-01	41591407271.76900000
2002-07-01	27957404606.32330000
2002-10-01	34423067651.71010000
2003-01-01	49664421599.34560400
2003-04-01	55178203477.57419600
2003-07-01	-532435771.47768410
2003-10-01	36014771865.10720000
2004-01-01	-2966605551.88153030
2004-04-01	28594466452.62090300
2004-07-01	57221296092.49450000
2004-10-01	38944974793.43500500
2005-01-01	-13399441922.85590000
2005-04-01	46775076626.80000000
2005-07-01	11423064881.34500100
2005-10-01	3207702278.08608960
2006-01-01	12468034119.91080000
2006-04-01	51967169086.13970000
2006-07-01	71374516.21937019
2006-10-01	47508454330.61560000
2007-01-01	19696885267.24160000
2007-04-01	92689847095.84780000
2007-07-01	21142835760.44890000
2007-10-01	127818215618.61900000
2008-01-01	-21575685430.70480000
2008-04-01	6146698592.26498000
2008-07-01	50606947727.57130000
2008-10-01	74940969667.78360000
2009-01-01	-37362516485.01120000
2009-04-01	54310858179.31361000
2009-07-01	-57008107619.12659500
2009-10-01	57499056564.06700000
2010-01-01	-38672175382.76020000
2010-04-01	-19092064260.43020200
2010-07-01	40605443508.90930000
2010-10-01	-93432507734.40150000
2011-01-01	53241127860.06900000
2011-04-01	94145867472.50700000
2011-07-01	37921121970.70830000
2011-10-01	-20150632398.27240000
2012-01-01	-32941329975.01130000
2012-04-01	51741664704.93490000
2012-07-01	-4081896845.57287000
2012-10-01	46434114361.82630000
2013-01-01	-27968009584.13930000
2013-04-01	-14265545681.27920000
2013-07-01	20194948330.02680200
2013-10-01	53483601526.32380000
2014-01-01	-605757646.89982310
2014-04-01	5598845373.27644000
2014-07-01	6231880245.32991000
2014-10-01	-6394300368.54510000
2015-01-01	-42447884605.76080000
2015-04-01	12378886276.48289900
2015-07-01	13354821174.94430000
2015-10-01	-33156487296.68840000
2016-01-01	-17692556648.08889800
2016-04-01	16178297922.44119800
2016-07-01	-5076102359.09620000
2016-10-01	-8760149810.16246000
2017-01-01	697939899.91782310
2017-04-01	40032980760.32310500
2017-07-01	-5834869296.58267000
2017-10-01	-2638816852.78425000
2018-01-01	13119497445.46300000
2018-04-01	6484933031.00287000