Quarter	US Dollars, sum over component sub-periods
2002-01-01	13050380930.974200
2002-04-01	13117657831.531900
2002-07-01	11939418129.861300
2002-10-01	12514741504.591400
2003-01-01	12745838168.879400
2003-04-01	12583520100.972000
2003-07-01	12215179741.579800
2003-10-01	15303452024.790400
2004-01-01	15258953807.248400
2004-04-01	14824769494.648201
2004-07-01	14473075344.146900
2004-10-01	17833155784.121300
2005-01-01	17709672184.808500
2005-04-01	17883188953.951202
2005-07-01	17589105305.499700
2005-10-01	18539020574.504700
2006-01-01	20664097533.265800
2006-04-01	20662436014.963600
2006-07-01	19603775606.609497
2006-10-01	22135010670.474102
2007-01-01	23489417406.230000
2007-04-01	24765688584.181000
2007-07-01	23143829593.571400
2007-10-01	26037779191.727700
2008-01-01	25901010327.479000
2008-04-01	25366261356.999000
2008-07-01	21888340868.747498
2008-10-01	20249559592.321900
2009-01-01	20347264523.073100
2009-04-01	20597571022.845898
2009-07-01	19506688503.086998
2009-10-01	20853707863.725800
2010-01-01	20018977395.154800
2010-04-01	20394517895.501200
2010-07-01	19511807323.281800
2010-10-01	22194903342.334400
2011-01-01	20233570047.024002
2011-04-01	22363799495.311398
2011-07-01	19620654239.303100
2011-10-01	20328479648.644900
2012-01-01	21554349276.216600
2012-04-01	20940825909.727300
2012-07-01	19007974581.315700
2012-10-01	22086021359.164900
2013-01-01	21654227462.035698
2013-04-01	21122097436.906500
2013-07-01	20267801678.980700
2013-10-01	22243320001.608000
2014-01-01	23638253153.231102
2014-04-01	24156076437.824600
2014-07-01	24221550275.525597
2014-10-01	25695822551.120800
2015-01-01	23274458700.615400
2015-04-01	23510150705.228703
2015-07-01	23494613394.761703
2015-10-01	26118120092.322100
2016-01-01	21185219204.482900
2016-04-01	26297215189.349500
2016-07-01	23538206894.432900
2016-10-01	24089873223.345900
2017-01-01	22303175641.496098
2017-04-01	24467837585.661602
2017-07-01	22916660570.636300
2017-10-01	26521228012.164000
2018-01-01	26306583159.893700
2018-04-01	27762279430.667297