Quarter	US Dollars, sum over component sub-periods
2006-01-01	4663800000
2006-04-01	13469200000
2006-07-01	-4486500000
2006-10-01	-12341100000
2007-01-01	491600000
2007-04-01	1659300000
2007-07-01	12397700000
2007-10-01	-6030000000
2008-01-01	2825000000
2008-04-01	459900000
2008-07-01	9438200000
2008-10-01	4882800000
2009-01-01	-8849700000
2009-04-01	5847800000
2009-07-01	-6194100000
2009-10-01	-7038400000
2010-01-01	3116400000
2010-04-01	295000000
2010-07-01	6584400000
2010-10-01	-347800000
2011-01-01	2876500000
2011-04-01	-3793400000
2011-07-01	6147300000
2011-10-01	1221300000
2012-01-01	-4572500000
2012-04-01	11803100000
2012-07-01	-2601100000
2012-10-01	736400000
2013-01-01	1669600000
2013-04-01	13662200000
2013-07-01	2994500000
2013-10-01	-726600000
2014-01-01	-1112000000
2014-04-01	13499500000
2014-07-01	2433200000
2014-10-01	1792100000
2015-01-01	12287000000
2015-04-01	3720200000
2015-07-01	12920400000
2015-10-01	-2557500000
2016-01-01	11431700000
2016-04-01	3345400000
2016-07-01	9406200000
2016-10-01	575100000
2017-01-01	14525600000
2017-04-01	1501300000
2017-07-01	-2799500000
2017-10-01	-7687100000
2018-01-01	7883600000
2018-04-01	1857000000