Quarter	US Dollars, sum over component sub-periods
2006-01-01	419895030683.703000
2006-04-01	453992099142.373000
2006-07-01	435035502070.370000
2006-10-01	390614949918.182000
2007-01-01	572146210535.818000
2007-04-01	506003417122.212040
2007-07-01	668085031940.684000
2007-10-01	801166020904.542000
2008-01-01	555689040440.746000
2008-04-01	333981696153.702940
2008-07-01	449999546654.471000
2008-10-01	367794586660.385000
2009-01-01	230651812485.311000
2009-04-01	85177496172.735200
2009-07-01	266147913455.882000
2009-10-01	367589962413.762000
2010-01-01	248528310297.195000
2010-04-01	232119518957.448000
2010-07-01	336905347619.296000
2010-10-01	359101445736.527000
2011-01-01	461087978785.600000
2011-04-01	322320675048.515000
2011-07-01	378003214815.759950
2011-10-01	577319103977.075000
2012-01-01	472020867605.638000
2012-04-01	365780451406.605040
2012-07-01	455203766524.733950
2012-10-01	305277517543.227000
2013-01-01	302964665701.963000
2013-04-01	541201783949.840000
2013-07-01	376032621681.722960
2013-10-01	524096265467.654970
2014-01-01	265073170506.085000
2014-04-01	147489986671.823000
2014-07-01	405735907395.314000
2014-10-01	267209448732.896000
2015-01-01	748614556561.489000
2015-04-01	402268406513.078000
2015-07-01	668066016418.732000
2015-10-01	404116287715.709000
2016-01-01	595932273546.970000
2016-04-01	463473079702.494000
2016-07-01	430999073507.142000
2016-10-01	264085043632.631000
2017-01-01	599725942048.097900
2017-04-01	410556457337.423000
2017-07-01	4559488873.242579
2017-10-01	-61357294665.467510
2018-01-01	155493163384.393000
2018-04-01	61802376724.893400