Quarter	US Dollars, sum over component sub-periods
1996-01-01	2481955558.23955000
1996-04-01	-1816400979.12068990
1996-07-01	2362928569.75413000
1996-10-01	-417717588.73113996
1997-01-01	3370260064.96963020
1997-04-01	955741077.90126500
1997-07-01	3891443565.96706960
1997-10-01	-960923061.45326300
1998-01-01	1485500428.90589000
1998-04-01	-2688120884.31426000
1998-07-01	8040134420.33737000
1998-10-01	-228388789.31711100
1999-01-01	-1321187781.80006000
1999-04-01	36986257.28173880
1999-07-01	2313361256.70655000
1999-10-01	-332123043.13529503
2000-01-01	4553263313.30032000
2000-04-01	1072096104.78656000
2000-07-01	-394909666.28222600
2000-10-01	5131715789.53148100
2001-01-01	2367518817.09653000
2001-04-01	1225078951.14343000
2001-07-01	-131041042.53697800
2001-10-01	3670440431.58668000
2002-01-01	2075858268.59320020
2002-04-01	6645134741.32272100
2002-07-01	1694894906.46687000
2002-10-01	-1882878871.17501020
2003-01-01	2785793702.31721970
2003-04-01	4015376604.01475950
2003-07-01	6074045291.52977000
2003-10-01	-3186558266.58595040
2004-01-01	13849159841.44270100
2004-04-01	-1198014737.78315000
2004-07-01	-4251248857.12828000
2004-10-01	-7041806911.15994000
2005-01-01	1163687474.57174020
2005-04-01	731194864.26590190
2005-07-01	3301188922.15234040
2005-10-01	-3195808684.17402030
2006-01-01	8909862877.58606000
2006-04-01	-2956193626.72570040
2006-07-01	3136655078.85482030
2006-10-01	9622683861.59466000
2007-01-01	-2732364301.20025970
2007-04-01	12876847731.27880000
2007-07-01	8521478478.55783100
2007-10-01	-2114194753.10991000
2008-01-01	2534966998.73289970
2008-04-01	8500720137.00281050
2008-07-01	-2295749117.63050030
2008-10-01	-18802224356.18630000
2009-01-01	1372617435.37580000
2009-04-01	-4397326071.58805900
2009-07-01	444861782.24390000
2009-10-01	7587193811.34563000
2010-01-01	4876399829.99417000
2010-04-01	3458808580.15914000
2010-07-01	5827178382.61210000
2010-10-01	-3751633612.90438000
2011-01-01	-2902619718.21285000
2011-04-01	4503560858.59373000
2011-07-01	-1181814018.29999000
2011-10-01	-1831018282.24473000
2012-01-01	369817869.06139500
2012-04-01	6233518355.61448000
2012-07-01	-5347009571.16275000
2012-10-01	1789671139.63382000
2013-01-01	-947397191.98962000
2013-04-01	-837152319.11562700
2013-07-01	-14452779826.11320000
2013-10-01	2579310451.78357000
2014-01-01	470078897.93357300
2014-04-01	3445970713.45670030
2014-07-01	4227877097.36304000
2014-10-01	-3456243589.16868000
2015-01-01	-2248081935.91918000
2015-04-01	-185816019.87572598
2015-07-01	-8269917149.78859000
2015-10-01	296548120.70635504
2016-01-01	-2312277072.67741000
2016-04-01	2201973961.66401000
2016-07-01	-732012123.00881700
2016-10-01	-3898428291.90255980
2017-01-01	1702760244.37967000
2017-04-01	-3184954047.46836000
2017-07-01	-2047137114.32037000
2017-10-01	-1860477745.38113000
2018-01-01	-948693520.78469500
2018-04-01	1131647020.47258000