Quarter	US Dollars, sum over component sub-periods
2002-01-01	7086671555.450760
2002-04-01	7536241240.678061
2002-07-01	8052472260.207680
2002-10-01	9249317302.876171
2003-01-01	9448081069.014990
2003-04-01	10301400402.209300
2003-07-01	10345913690.594900
2003-10-01	11713397900.026900
2004-01-01	12192711313.738100
2004-04-01	13068484710.042900
2004-07-01	12532441986.069800
2004-10-01	14122475891.366001
2005-01-01	14447809017.064700
2005-04-01	13151439469.154400
2005-07-01	13644995511.622700
2005-10-01	14106991739.109800
2006-01-01	15093959685.155900
2006-04-01	17264572983.292603
2006-07-01	16623889554.450802
2006-10-01	17522055975.322000
2007-01-01	20625154905.077400
2007-04-01	19699474026.086400
2007-07-01	21285822814.622800
2007-10-01	25483364584.092400
2008-01-01	24275455248.504300
2008-04-01	27475039781.283100
2008-07-01	26097464169.328000
2008-10-01	19817460415.653500
2009-01-01	15719397018.208900
2009-04-01	17120837216.477299
2009-07-01	18631269175.970398
2009-10-01	19459719744.241500
2010-01-01	18485762011.603900
2010-04-01	16473179439.082703
2010-07-01	15417662032.504400
2010-10-01	17856907312.362500
2011-01-01	16771755102.834198
2011-04-01	18815931960.497200
2011-07-01	18276464340.352600
2011-10-01	15960443393.282600
2012-01-01	16207727105.424799
2012-04-01	15248460556.801400
2012-07-01	14174017648.621700
2012-10-01	16353622937.292100
2013-01-01	15881438165.441599
2013-04-01	15319495636.858501
2013-07-01	15917794443.259300
2013-10-01	16182280718.340300
2014-01-01	15693508630.429600
2014-04-01	17317614062.970398
2014-07-01	16311499515.672200
2014-10-01	15789089662.224700
2015-01-01	12464077713.819302
2015-04-01	12284872218.807600
2015-07-01	10250961962.387500
2015-10-01	11620090382.954900
2016-01-01	10645512032.884201
2016-04-01	11549635733.281801
2016-07-01	11281467322.590200
2016-10-01	11931259390.889200
2017-01-01	12537344828.142101
2017-04-01	12313102733.237500
2017-07-01	13095570180.534800
2017-10-01	14330388709.676199
2018-01-01	15482629104.101500
2018-04-01	15879985715.705200