Quarter	US Dollars, monthly level
1999-01-01	578440032468.0990
1999-04-01	575622722851.8030
1999-07-01	570366243915.5330
1999-10-01	634746502425.5100
2000-01-01	619322001947.6150
2000-04-01	613773525779.7080
2000-07-01	583219855519.4270
2000-10-01	634621171569.8640
2001-01-01	651068966410.9540
2001-04-01	614092232559.0050
2001-07-01	586143106668.8140
2001-10-01	623978097768.3580
2002-01-01	600862698609.1200
2002-04-01	655746788623.1339
2002-07-01	667132276327.5221
2002-10-01	719285240697.0440
2003-01-01	744646736019.0160
2003-04-01	780799010988.4359
2003-07-01	761128304463.2731
2003-10-01	871810690337.6580
2004-01-01	907358373187.5050
2004-04-01	923742280226.8191
2004-07-01	906286048711.0380
2004-10-01	1034725257893.6600
2005-01-01	1004309073936.9900
2005-04-01	1042896564794.4001
2005-07-01	987806822224.8201
2005-10-01	1042549030714.5400
2006-01-01	1082800346683.9300
2006-04-01	1163047139085.3000
2006-07-01	1122465593871.7302
2006-10-01	1241031604071.4500
2007-01-01	1263097282872.3400
2007-04-01	1316238832471.5300
2007-07-01	1316686251769.3300
2007-10-01	1475027598783.4100
2008-01-01	1532970503251.3000
2008-04-01	1651998741504.4500
2008-07-01	1526327676224.4800
2008-10-01	1247663519968.4800
2009-01-01	1046647596293.1599
2009-04-01	1098064750256.3200
2009-07-01	1176002420412.6602
2009-10-01	1292651680600.0300
2010-01-01	1241118065096.4200
2010-04-01	1242019278129.0700
2010-07-01	1272793651850.4000
2010-10-01	1427063604499.3600
2011-01-01	1488511654559.3901
2011-04-01	1579406277454.1301
2011-07-01	1520305885425.3000
2011-10-01	1502389168885.4802
2012-01-01	1487594083133.6099
2012-04-01	1455156577170.4000
2012-07-01	1394583561064.0898
2012-10-01	1479846750054.0100
2013-01-01	1488412976706.7300
2013-04-01	1521989279502.1800
2013-07-01	1491304874031.5300
2013-10-01	1573793970819.4400
2014-01-01	1566248205267.3599
2014-04-01	1581103786105.9500
2014-07-01	1515859504767.1700
2014-10-01	1493152919994.8900
2015-01-01	1336260578148.0999
2015-04-01	1370751727259.9300
2015-07-01	1326657352159.4700
2015-10-01	1356603915103.0000
2016-01-01	1301016802256.7800
2016-04-01	1395829713394.4400
2016-07-01	1316908890706.4300
2016-10-01	1363474433085.5598
2017-01-01	1392588187400.7800
2017-04-01	1438090555435.5600
2017-07-01	1484080213736.2100
2017-10-01	1586155365150.1900
2018-01-01	1655880884669.0898
2018-04-01	1643179347979.1099