Quarter	US Dollars, sum over component sub-periods
1999-01-01	19790876619.3006020
1999-04-01	5773026386.5753990
1999-07-01	9211498313.1959800
1999-10-01	9168671759.5537400
2000-01-01	2246026460.9189596
2000-04-01	8526339230.5760500
2000-07-01	21242886785.5750000
2000-10-01	6328130721.1470800
2001-01-01	-8378580817.6358400
2001-04-01	12717403034.9083000
2001-07-01	19827312027.9419020
2001-10-01	-8033230900.6590900
2002-01-01	-1335106479.3359100
2002-04-01	3740072376.5512700
2002-07-01	7176989690.9938000
2002-10-01	-5148403119.5890500
2003-01-01	-4886679357.5907510
2003-04-01	-8029617316.4866600
2003-07-01	-5705955445.2862210
2003-10-01	-5139187884.0122200
2004-01-01	10042453602.3027000
2004-04-01	-17389292391.0817000
2004-07-01	7482784873.6339000
2004-10-01	9841171284.7833100
2005-01-01	-12031322864.9134000
2005-04-01	2528348506.5579996
2005-07-01	-12668175294.9090000
2005-10-01	10359320297.4156000
2006-01-01	-17076335008.8041000
2006-04-01	-76669987.7679708
2006-07-01	-15272871926.0127000
2006-10-01	1851012244.1539300
2007-01-01	907291792.9129449
2007-04-01	-7479140621.1405900
2007-07-01	-11114493710.9812000
2007-10-01	19214682951.4993020
2008-01-01	12062068148.2261000
2008-04-01	-13864827625.1446000
2008-07-01	-20625753829.5281030
2008-10-01	-24692694895.2681000
2009-01-01	-329167972.6541020
2009-04-01	-19193531636.0985030
2009-07-01	-6439767664.5081500
2009-10-01	-30105122660.9388000
2010-01-01	9339052909.3730600
2010-04-01	5607539406.4078900
2010-07-01	10041511650.6755000
2010-10-01	-27280782918.1494980
2011-01-01	-16133260798.3568000
2011-04-01	-30943449951.7119000
2011-07-01	-7563892109.9558600
2011-10-01	-24001294834.3691000
2012-01-01	-12868874996.8066000
2012-04-01	-10864095352.5542010
2012-07-01	-8922110517.7604400
2012-10-01	-15462031876.4303000
2013-01-01	1307619244.0970900
2013-04-01	-3748248293.0762100
2013-07-01	-23739594908.2212000
2013-10-01	7279236040.1786500
2014-01-01	-16740564834.5732000
2014-04-01	-23615800886.2520000
2014-07-01	6931228336.6230510
2014-10-01	20518949024.8587000
2015-01-01	-19155414232.1486000
2015-04-01	15046673418.9844000
2015-07-01	-7408351644.8704300
2015-10-01	10278511061.9734000
2016-01-01	-30900530165.2319000
2016-04-01	17354942470.1611000
2016-07-01	-16242634851.3969000
2016-10-01	15344808542.0078010
2017-01-01	-30241576029.8743970
2017-04-01	-3976793451.5350700
2017-07-01	11702624329.9416000
2017-10-01	-11591482864.2607000
2018-01-01	-18669108766.5299000
2018-04-01	-28299513963.5443000