Quarter	US Dollars, sum over component sub-periods
1991-01-01	20800259077.546200
1991-04-01	3539987622.087210
1991-07-01	6581368884.641120
1991-10-01	27817353070.130500
1992-01-01	8534135637.389099
1992-04-01	5957266994.982340
1992-07-01	59082225469.443504
1992-10-01	34420655914.302300
1993-01-01	39496632212.616700
1993-04-01	40499375798.776300
1993-07-01	28216462928.447998
1993-10-01	53045801117.252000
1994-01-01	-3696815897.227700
1994-04-01	-5851836455.178220
1994-07-01	17807551696.398098
1994-10-01	51470410896.605300
1995-01-01	23753864411.055800
1995-04-01	53997549785.131100
1995-07-01	23488804573.170700
1995-10-01	26725479442.818703
1996-01-01	26683727647.259100
1996-04-01	24950679709.573600
1996-07-01	8538258213.904221
1996-10-01	76215391721.659600
1997-01-01	75609175591.516800
1997-04-01	54412969353.802990
1997-07-01	36771594226.302400
1997-10-01	61291751119.247200
1998-01-01	102414390460.743000
1998-04-01	91406683696.524800
1998-07-01	31322233072.996403
1998-10-01	116984979529.865000
1999-01-01	126682488946.992000
1999-04-01	78332665921.890500
1999-07-01	73124657203.719100
1999-10-01	112855410057.373000
2000-01-01	164326206731.479980
2000-04-01	89545239553.536100
2000-07-01	93225791746.011500
2000-10-01	29579098516.447200
2001-01-01	145350523916.648000
2001-04-01	56375476955.007500
2001-07-01	50417818257.186300
2001-10-01	24279721625.049200
2002-01-01	47696525564.141600
2002-04-01	73518585233.191900
2002-07-01	92400791206.705100
2002-10-01	21038820287.959198
2003-01-01	131106214829.631990
2003-04-01	93956404859.316800
2003-07-01	4339407820.394230
2003-10-01	41737011859.137000
2004-01-01	113696126641.980000
2004-04-01	24066356422.589400
2004-07-01	128635429899.555010
2004-10-01	63723430017.251600
2005-01-01	218296238191.621980
2005-04-01	136052585191.616990
2005-07-01	84977261349.619300
2005-10-01	76861161297.380700
2006-01-01	224050512989.915000
2006-04-01	127370216728.371000
2006-07-01	103830802925.196000
2006-10-01	152825246454.961000
2007-01-01	234970218750.145000
2007-04-01	301129775509.827000
2007-07-01	212239534161.822000
2007-10-01	171893162575.844000
2008-01-01	331010956717.524000
2008-04-01	100557489676.508010
2008-07-01	113359922792.051000
2008-10-01	-194057184950.287000
2009-01-01	-53208116243.723800
2009-04-01	106790064588.331010
2009-07-01	-29711331443.691402
2009-10-01	45436038610.606000
2010-01-01	119967184920.878000
2010-04-01	153612017063.504000
2010-07-01	122922576855.297000
2010-10-01	156994465208.604980
2011-01-01	78909419235.353000
2011-04-01	120975806099.879000
2011-07-01	241291970610.877000
2011-10-01	-69388721526.038100
2012-01-01	332576422800.382000
2012-04-01	143319628055.655000
2012-07-01	32722747551.113000
2012-10-01	-22993186063.011200
2013-01-01	32627145357.001797
2013-04-01	79233006078.169900
2013-07-01	-8167522720.906810
2013-10-01	-22564542833.597900
2014-01-01	136055634380.045000
2014-04-01	158202006053.123020
2014-07-01	101667728771.739000
2014-10-01	21278123917.277298
2015-01-01	269755197825.991030
2015-04-01	-7043311991.479890
2015-07-01	98237366416.906600
2015-10-01	-56236904130.409600
2016-01-01	166071751127.348000
2016-04-01	174691063509.428000
2016-07-01	55828198972.948395
2016-10-01	44855630559.317700
2017-01-01	242838331773.240000
2017-04-01	45503271310.084000
2017-07-01	66686401729.200294
2017-10-01	43535179241.918396
2018-01-01	192135015511.253000
2018-04-01	140242037228.692020