Quarter	US Dollars, sum over component sub-periods
1999-01-01	138101727098.43800
1999-04-01	183203499818.53300
1999-07-01	131002732670.69499
1999-10-01	288272422596.33795
2000-01-01	303395228869.69000
2000-04-01	203221046399.38898
2000-07-01	245150341783.46900
2000-10-01	258720381523.89700
2001-01-01	279971555890.96704
2001-04-01	145107193911.36300
2001-07-01	144734385764.25998
2001-10-01	255200402950.49500
2002-01-01	91689292181.99670
2002-04-01	162206212475.53400
2002-07-01	124855618629.26001
2002-10-01	199363056673.24300
2003-01-01	245848709657.56100
2003-04-01	293442813508.16400
2003-07-01	15590349756.79900
2003-10-01	200255791648.00198
2004-01-01	397037585517.55597
2004-04-01	172955242355.49000
2004-07-01	170100084053.07500
2004-10-01	314473158123.63800
2005-01-01	568627759604.50000
2005-04-01	374604595030.62900
2005-07-01	421689994902.89500
2005-10-01	363923754599.78400
2006-01-01	595789190489.26500
2006-04-01	419271713436.71600
2006-07-01	482338784251.04400
2006-10-01	714338517571.07600
2007-01-01	855978673116.36400
2007-04-01	722485253617.92100
2007-07-01	626257174646.91300
2007-10-01	528170480717.12000
2008-01-01	837177345953.88000
2008-04-01	155898083762.09003
2008-07-01	196686168851.88700
2008-10-01	-556073552602.90210
2009-01-01	-192362900888.86000
2009-04-01	-74795397903.32330
2009-07-01	215722203794.86298
2009-10-01	163747826887.17502
2010-01-01	325975704980.57800
2010-04-01	207564094030.79898
2010-07-01	271041981593.89100
2010-10-01	80513532073.17729
2011-01-01	434073585132.73895
2011-04-01	314307959749.52500
2011-07-01	198777729164.02798
2011-10-01	-75519062353.27390
2012-01-01	511808259617.72300
2012-04-01	153268123304.13400
2012-07-01	199074434509.04300
2012-10-01	149578351848.07498
2013-01-01	370743702816.28296
2013-04-01	327007890368.80600
2013-07-01	168517743768.48600
2013-10-01	392061994239.57697
2014-01-01	475089418198.42800
2014-04-01	325821810299.64905
2014-07-01	333762552046.74800
2014-10-01	119392738261.96901
2015-01-01	839278669338.53500
2015-04-01	131327684142.64400
2015-07-01	167609509175.49100
2015-10-01	351027621582.69000
2016-01-01	533406391099.20000
2016-04-01	351894635769.98500
2016-07-01	310117605435.96900
2016-10-01	134250103972.64099
2017-01-01	797509817487.16800
2017-04-01	273147201986.71503
2017-07-01	72807846731.97589
2017-10-01	96481078826.29640
2018-01-01	557305830601.07000
2018-04-01	117514991435.43300