Quarter	US Dollars, sum over component sub-periods
1999-01-01	72126525844.998110
1999-04-01	61103410529.848500
1999-07-01	10534917128.229399
1999-10-01	54242958135.562300
2000-01-01	170839189835.956000
2000-04-01	-3589840964.111100
2000-07-01	86358701233.245700
2000-10-01	85061101994.929600
2001-01-01	229921506883.867000
2001-04-01	8515259899.352860
2001-07-01	-17194902513.576600
2001-10-01	16549225928.361898
2002-01-01	44199651141.245290
2002-04-01	-4960400884.956369
2002-07-01	-2835973311.284970
2002-10-01	27627895870.083900
2003-01-01	101100157113.459000
2003-04-01	45571968699.596100
2003-07-01	-13021600432.249200
2003-10-01	78143261569.541600
2004-01-01	219595068780.342000
2004-04-01	28136472890.892900
2004-07-01	30576713091.476597
2004-10-01	91622509385.472990
2005-01-01	301606039791.790040
2005-04-01	127848352282.582000
2005-07-01	198838401391.953000
2005-10-01	191334623982.301030
2006-01-01	338969339776.763000
2006-04-01	106932009005.503000
2006-07-01	253044327261.520000
2006-10-01	262058187132.095000
2007-01-01	374474198602.356000
2007-04-01	325374970908.388000
2007-07-01	449141585417.605000
2007-10-01	168328447639.141000
2008-01-01	569621467406.766000
2008-04-01	46538396736.810800
2008-07-01	119887287853.479000
2008-10-01	-279878122944.883000
2009-01-01	-269945059819.152980
2009-04-01	-241187002550.225000
2009-07-01	-121700451554.055010
2009-10-01	-144915697133.168000
2010-01-01	222353592361.598020
2010-04-01	2928932320.818080
2010-07-01	69931309966.712400
2010-10-01	-37768797725.281200
2011-01-01	32157143557.402800
2011-04-01	22540833047.758500
2011-07-01	181829923116.650000
2011-10-01	-161978425259.768980
2012-01-01	248529410707.206000
2012-04-01	-28390014991.760700
2012-07-01	-86572001676.047800
2012-10-01	-370429480814.650000
2013-01-01	40664187552.557300
2013-04-01	-132677541496.032000
2013-07-01	-148790381478.108980
2013-10-01	-239753371783.334000
2014-01-01	185693499115.486000
2014-04-01	-63105281429.875496
2014-07-01	82162804543.741800
2014-10-01	-51381655958.920300
2015-01-01	254951854081.706000
2015-04-01	-130169652161.633000
2015-07-01	12366522163.496200
2015-10-01	-209755817408.110000
2016-01-01	287111410304.017000
2016-04-01	186878707082.884000
2016-07-01	198955538847.530980
2016-10-01	-4322966917.388909
2017-01-01	321756687204.711000
2017-04-01	-20835274319.505500
2017-07-01	55344346013.198200
2017-10-01	-119726452985.517000
2018-01-01	260257846242.729000
2018-04-01	214408991743.074980