Quarter	US Dollars, sum over component sub-periods
1999-01-01	191415077732.75700
1999-04-01	189744783606.36000
1999-07-01	194584512523.53897
1999-10-01	219867530324.58502
2000-01-01	222055503995.55700
2000-04-01	220521203491.00200
2000-07-01	215616159372.86100
2000-10-01	234663398727.42798
2001-01-01	231325779541.55300
2001-04-01	214614258938.96900
2001-07-01	203652934508.74300
2001-10-01	209583223443.14000
2002-01-01	201747475478.90100
2002-04-01	218765266169.91098
2002-07-01	220620623753.61800
2002-10-01	240638322724.88800
2003-01-01	251368767930.12900
2003-04-01	260772300952.38702
2003-07-01	251128453356.90000
2003-10-01	294039128593.19904
2004-01-01	298500775741.19600
2004-04-01	306470007568.91200
2004-07-01	316031506570.67400
2004-10-01	364751607653.22797
2005-01-01	342582778127.80800
2005-04-01	363294357087.15704
2005-07-01	365140518911.34500
2005-10-01	392219803875.99700
2006-01-01	404778667192.70200
2006-04-01	432911429949.14300
2006-07-01	434854338246.24304
2006-10-01	464133258321.58000
2007-01-01	467584363292.39400
2007-04-01	482478714392.00400
2007-07-01	502500504383.85700
2007-10-01	560319572418.62610
2008-01-01	585171362489.41910
2008-04-01	625190320476.53810
2008-07-01	616533847131.02700
2008-10-01	491803725216.06400
2009-01-01	403786318771.32697
2009-04-01	403145873730.72200
2009-07-01	439118630939.36800
2009-10-01	479957197613.62396
2010-01-01	472526464570.58700
2010-04-01	479712098750.49200
2010-07-01	500971920892.89197
2010-10-01	551414131153.99100
2011-01-01	583585161517.78300
2011-04-01	618050038942.02300
2011-07-01	609869688081.61900
2011-10-01	582693611275.55700
2012-01-01	588201877796.56500
2012-04-01	562700381608.45500
2012-07-01	544084815008.65704
2012-10-01	569848681427.40800
2013-01-01	558779614016.38500
2013-04-01	553554890424.02000
2013-07-01	567291808421.70010
2013-10-01	583780302617.16200
2014-01-01	584184725814.19000
2014-04-01	588371045724.52000
2014-07-01	573775373219.01100
2014-10-01	544202284929.67300
2015-01-01	494570145795.28300
2015-04-01	500117181209.09204
2015-07-01	493494715940.28796
2015-10-01	491483097720.19600
2016-01-01	472010916070.33000
2016-04-01	495811137034.68000
2016-07-01	485261548715.07697
2016-10-01	500075253056.06800
2017-01-01	526586597252.65497
2017-04-01	524808061699.46900
2017-07-01	549426702282.88495
2017-10-01	582115226108.30700
2018-01-01	608967845644.83700
2018-04-01	601513274847.21600