Quarter	US Dollars, sum over component sub-periods
1999-01-01	188304281046.51900
1999-04-01	186263214370.92000
1999-07-01	194345940589.76700
1999-10-01	212260770963.82602
2000-01-01	212610740592.90800
2000-04-01	213630371149.19998
2000-07-01	212863901067.07400
2000-10-01	228810442977.30400
2001-01-01	223536495009.37300
2001-04-01	210829446550.25100
2001-07-01	199643524324.94300
2001-10-01	200794677165.23400
2002-01-01	192238852392.84702
2002-04-01	209735570899.35400
2002-07-01	212987792913.66500
2002-10-01	229787257774.42900
2003-01-01	243894252619.24100
2003-04-01	248349282326.42100
2003-07-01	241902343271.94200
2003-10-01	272993803187.00098
2004-01-01	274277122502.01000
2004-04-01	290118552693.63000
2004-07-01	299375952305.05000
2004-10-01	333472953220.52500
2005-01-01	321349282047.59000
2005-04-01	343693552383.20496
2005-07-01	347287025811.85803
2005-10-01	366571863284.30700
2006-01-01	384329286889.57600
2006-04-01	411996485728.56300
2006-07-01	415173325216.72400
2006-10-01	437613347983.66600
2007-01-01	442837324083.03900
2007-04-01	452908473325.17303
2007-07-01	481590847511.75300
2007-10-01	527308138498.08200
2008-01-01	563853069097.94700
2008-04-01	609346833866.17810
2008-07-01	612063059414.36100
2008-10-01	482921657398.51600
2009-01-01	391932368578.23800
2009-04-01	386570855123.56400
2009-07-01	426031111998.97500
2009-10-01	457828079221.50995
2010-01-01	447419232403.90200
2010-04-01	463477681299.73100
2010-07-01	490904045427.84400
2010-10-01	532957423952.50300
2011-01-01	558838380123.69300
2011-04-01	594441967039.47190
2011-07-01	591342741295.81100
2011-10-01	563356091116.67800
2012-01-01	568470783071.25600
2012-04-01	546411419756.91000
2012-07-01	533639563828.59406
2012-10-01	551763399170.59900
2013-01-01	539084308380.57200
2013-04-01	533455268105.11005
2013-07-01	549727130910.17790
2013-10-01	563521350271.30910
2014-01-01	555415074965.20700
2014-04-01	560144664921.89100
2014-07-01	556134185163.85190
2014-10-01	522064844958.18100
2015-01-01	478061997201.84600
2015-04-01	478221307176.53296
2015-07-01	471820618249.85400
2015-10-01	462173200659.32697
2016-01-01	439525407040.36200
2016-04-01	457891903275.66797
2016-07-01	459476533269.30500
2016-10-01	463925896846.82500
2017-01-01	492820158338.92100
2017-04-01	489121509423.60706
2017-07-01	513492575156.55700
2017-10-01	536178382050.26196
2018-01-01	563087945567.38600
2018-04-01	556153765127.46100