Quarter	US Dollars, sum over component sub-periods
1997-01-01	-5624117525.08799900
1997-04-01	30633381435.82260000
1997-07-01	-419568182.16841495
1997-10-01	-6792859836.98009000
1998-01-01	-23083598944.11240000
1998-04-01	20097689972.85630000
1998-07-01	7208332723.69098950
1998-10-01	11858907305.11680000
1999-01-01	5292608658.61281000
1999-04-01	-101448019.97276900
1999-07-01	-11606655661.48140000
1999-10-01	-4107946889.77968000
2000-01-01	869779917.39323200
2000-04-01	-2078820495.86663000
2000-07-01	-13538081717.56070100
2000-10-01	-509519731.05141400
2001-01-01	-1863752147.51948000
2001-04-01	1871696942.47448000
2001-07-01	157784112.44248300
2001-10-01	11895343917.00900000
2002-01-01	-12215829802.72220000
2002-04-01	7012060946.93963050
2002-07-01	23127495151.44670000
2002-10-01	9637498494.17048000
2003-01-01	-9195803026.60861000
2003-04-01	6159939836.93693000
2003-07-01	2360502775.45180000
2003-10-01	-13461364327.81440200
2004-01-01	7772181506.97323000
2004-04-01	7816021704.75223000
2004-07-01	21895704496.24770000
2004-10-01	-2858952879.49411000
2005-01-01	17670227372.88890000
2005-04-01	11439864571.73330000
2005-07-01	-31639950714.90300000
2005-10-01	-24833824088.40850000
2006-01-01	27266080983.69690000
2006-04-01	33786326904.76760000
2006-07-01	-44556816294.87430000
2006-10-01	-20558489998.13610000
2007-01-01	-40034905919.93750000
2007-04-01	-14472972910.70030000
2007-07-01	10222199497.91500000
2007-10-01	-40255195504.72470000
2008-01-01	34380864472.17650000
2008-04-01	-40174572069.74920000
2008-07-01	-30943879027.70930000
2008-10-01	15416352996.15220000
2009-01-01	12642392056.44230000
2009-04-01	8081056955.34330900
2009-07-01	25603154470.68670000
2009-10-01	-49982743504.55960000
2010-01-01	-51543989008.92530000
2010-04-01	-69538317248.05621000
2010-07-01	-18630428823.18390000
2010-10-01	-59055653713.40690000
2011-01-01	9264319929.63271000
2011-04-01	-17916371226.51800000
2011-07-01	-82006879549.41880000
2011-10-01	-24389325198.81830000
2012-01-01	-65550872996.57380000
2012-04-01	-29680062197.22220000
2012-07-01	32914203779.61469700
2012-10-01	62881179157.02530000
2013-01-01	1959449624.10109000
2013-04-01	-6812147420.44791000
2013-07-01	6914445118.89938000
2013-10-01	26189188603.04360000
2014-01-01	67014338050.01710500
2014-04-01	62500556764.28290000
2014-07-01	-40274767825.66350000
2014-10-01	-18101576341.10490000
2015-01-01	-3255609894.18040000
2015-04-01	-19200988720.49170000
2015-07-01	-34161350194.36130000
2015-10-01	-18143054764.98660000
2016-01-01	-29283699628.71240000
2016-04-01	-24587580021.16520000
2016-07-01	-52254060512.58670000
2016-10-01	10053160852.25290100
2017-01-01	-46001165525.72880000
2017-04-01	11894087715.25220100
2017-07-01	-17671385554.82750000
2017-10-01	14934455218.14490000
2018-01-01	-3521963252.03230000
2018-04-01	-85000985726.17040000