Quarter	US Dollars, sum over component sub-periods
2006-01-01	516448730497.22296
2006-04-01	476570507765.05096
2006-07-01	513801805837.63000
2006-10-01	471373923201.82196
2007-01-01	699861143877.25790
2007-04-01	706083048233.50400
2007-07-01	673138109520.68900
2007-10-01	936168545593.90310
2008-01-01	695363922229.91200
2008-04-01	505671240487.06400
2008-07-01	628937435014.64600
2008-10-01	476241992293.13995
2009-01-01	383521499667.66705
2009-04-01	130722689877.37500
2009-07-01	357649695190.15200
2009-10-01	341732935767.66800
2010-01-01	325192345504.14400
2010-04-01	436235540438.47900
2010-07-01	405008434833.82104
2010-10-01	305132975994.79700
2011-01-01	595720048429.55090
2011-04-01	443552591933.86900
2011-07-01	435354332684.60297
2011-10-01	598947071550.03700
2012-01-01	514457099026.54400
2012-04-01	405805727594.94600
2012-07-01	505374401264.00800
2012-10-01	287116668675.43600
2013-01-01	409939636683.00104
2013-04-01	492376559329.42100
2013-07-01	372973547884.98900
2013-10-01	586717051025.99600
2014-01-01	263442872987.53300
2014-04-01	230400538812.23800
2014-07-01	463094555548.06696
2014-10-01	309495580371.29900
2015-01-01	810296082887.52500
2015-04-01	383833603096.92800
2015-07-01	729906040361.87600
2015-10-01	346381788849.59600
2016-01-01	521436968271.09000
2016-04-01	389014421164.94000
2016-07-01	454037951721.20200
2016-10-01	285356343829.17400
2017-01-01	631026928933.57900
2017-04-01	432593462458.93700
2017-07-01	123704810127.00401
2017-10-01	-6424517302.47109
2018-01-01	108914846116.97600
2018-04-01	96711971988.44960