Quarter	US Dollars, sum over component sub-periods
1999-01-01	22187423700.135900
1999-04-01	22000482581.386300
1999-07-01	23940038136.606400
1999-10-01	23059718038.687500
2000-01-01	18913023697.505302
2000-04-01	21062766156.233500
2000-07-01	23946707658.610300
2000-10-01	20714672478.786500
2001-01-01	20806670633.025597
2001-04-01	20950422919.126100
2001-07-01	23992099447.892600
2001-10-01	21491512483.143600
2002-01-01	19914388634.979603
2002-04-01	22741148217.294403
2002-07-01	26191684143.695300
2002-10-01	26602417207.515100
2003-01-01	24925070589.750000
2003-04-01	28586982459.190800
2003-07-01	29225433266.120700
2003-10-01	28482690525.492100
2004-01-01	28758446740.616400
2004-04-01	30618074847.729500
2004-07-01	32314137487.789300
2004-10-01	33661028805.461903
2005-01-01	31728830106.228500
2005-04-01	33650065887.679302
2005-07-01	35519183061.178100
2005-10-01	33067759153.736603
2006-01-01	33089308496.913400
2006-04-01	36163096525.574700
2006-07-01	37509857363.144005
2006-10-01	39235010056.048904
2007-01-01	36475227859.592700
2007-04-01	41042255986.053600
2007-07-01	46701771694.038795
2007-10-01	44853098144.627200
2008-01-01	46871419949.975700
2008-04-01	52697591793.812300
2008-07-01	49822704234.089390
2008-10-01	44730801699.007600
2009-01-01	40723152348.116100
2009-04-01	42844309550.397000
2009-07-01	46018162046.844000
2009-10-01	46212773516.166100
2010-01-01	43642671463.730400
2010-04-01	43785314494.902100
2010-07-01	46119874681.809296
2010-10-01	47722028290.920810
2011-01-01	48242551463.561104
2011-04-01	53128776597.401794
2011-07-01	54040105044.678100
2011-10-01	49900974333.699800
2012-01-01	47963541642.026400
2012-04-01	51067146981.204600
2012-07-01	52681746535.443900
2012-10-01	52124983069.073800
2013-01-01	52179417767.729100
2013-04-01	55861959665.417700
2013-07-01	59807301065.790405
2013-10-01	60321836729.363700
2014-01-01	60514092531.361300
2014-04-01	64709652991.652000
2014-07-01	64745328406.422295
2014-10-01	62670636554.900795
2015-01-01	55656069560.262400
2015-04-01	56886247227.668600
2015-07-01	60692009258.711900
2015-10-01	60084369785.035194
2016-01-01	58319419113.786896
2016-04-01	60159057850.077100
2016-07-01	62167468593.090300
2016-10-01	59664917028.059800
2017-01-01	57346151959.965500
2017-04-01	59678296419.828300
2017-07-01	64203528602.594900
2017-10-01	64726962775.857796
2018-01-01	63708702329.068596
2018-04-01	63917806131.071304