Quarter	US Dollars, sum over component sub-periods
1999-01-01	135468344278.86500
1999-04-01	381866540772.15900
1999-07-01	271442570679.24500
1999-10-01	215897743008.02600
2000-01-01	275382797987.37900
2000-04-01	251321540901.96100
2000-07-01	215306721281.07600
2000-10-01	248221342994.75600
2001-01-01	218673528295.11800
2001-04-01	247605766260.85900
2001-07-01	107384590425.70200
2001-10-01	247189571905.99200
2002-01-01	78387519046.30890
2002-04-01	325446688373.56300
2002-07-01	196625098859.91200
2002-10-01	214072655021.77200
2003-01-01	235595832195.02600
2003-04-01	410406142965.34400
2003-07-01	228311644141.00200
2003-10-01	362213657288.75195
2004-01-01	532313619185.86800
2004-04-01	441545775289.69100
2004-07-01	369774828539.38800
2004-10-01	421334405688.98200
2005-01-01	528495699772.73395
2005-04-01	520488003975.45197
2005-07-01	358830592425.85000
2005-10-01	603615678110.88700
2006-01-01	540034330214.93396
2006-04-01	451559941805.07800
2006-07-01	478980446372.64200
2006-10-01	720729334330.63200
2007-01-01	656051136983.52500
2007-04-01	850304229043.63100
2007-07-01	214898677987.13000
2007-10-01	598255913981.31410
2008-01-01	366675310282.58203
2008-04-01	582385181561.69500
2008-07-01	97904136855.61680
2008-10-01	-66702135405.02809
2009-01-01	318684541789.06000
2009-04-01	414518029471.02997
2009-07-01	229164754710.98300
2009-10-01	277134033702.99700
2010-01-01	402489426545.75903
2010-04-01	278791483418.66100
2010-07-01	549307398655.50900
2010-10-01	187592394348.89100
2011-01-01	471560002611.97296
2011-04-01	426558711581.84400
2011-07-01	66502606148.20590
2011-10-01	-80539584827.25480
2012-01-01	227294566270.09500
2012-04-01	115562495164.15700
2012-07-01	161831130924.84100
2012-10-01	388341439463.55096
2013-01-01	290640824459.25300
2013-04-01	128262094295.46300
2013-07-01	254484557961.99600
2013-10-01	412208190311.80000
2014-01-01	392519069489.06604
2014-04-01	401600744978.56104
2014-07-01	360365199805.62897
2014-10-01	176963593313.54300
2015-01-01	438668653563.43200
2015-04-01	343930068894.84100
2015-07-01	-188146092047.57498
2015-10-01	9756697549.76008
2016-01-01	-100399869765.45999
2016-04-01	82562952951.49500
2016-07-01	233998890034.11500
2016-10-01	-30794635261.51250
2017-01-01	287431109904.69196
2017-04-01	418560793819.33300
2017-07-01	322930382306.42300
2017-10-01	221340747335.69200
2018-01-01	345825865070.15300