Quarter	Billions of US Dollars
1999-01-01	8018.778
1999-04-01	7929.439
1999-07-01	8352.609
1999-10-01	8125.820
2000-01-01	7845.001
2000-04-01	8021.234
2000-07-01	7546.148
2000-10-01	8272.644
2001-01-01	7962.732
2001-04-01	7797.195
2001-07-01	8516.595
2001-10-01	8455.491
2002-01-01	8464.506
2002-04-01	9799.062
2002-07-01	9765.606
2002-10-01	10572.042
2003-01-01	11069.795
2003-04-01	11793.769
2003-07-01	12124.872
2003-10-01	13363.937
2004-01-01	13060.844
2004-04-01	13223.148
2004-07-01	13643.363
2004-10-01	15296.880
2005-01-01	14738.752
2005-04-01	14087.435
2005-07-01	14204.539
2005-10-01	14183.293
2006-01-01	14937.215
2006-04-01	16067.741
2006-07-01	16110.662
2006-10-01	17090.662
2007-01-01	17579.982
2007-04-01	18329.317
2007-07-01	19505.781
2007-10-01	20957.235
2008-01-01	22875.026
2008-04-01	23231.187
2008-07-01	21402.612
2008-10-01	21023.411
2009-01-01	20237.651
2009-04-01	21586.925
2009-07-01	22305.428
2009-10-01	22073.228
2010-01-01	20721.460
2010-04-01	19045.744
2010-07-01	21221.483
2010-10-01	21012.062
2011-01-01	22369.118
2011-04-01	22998.674
2011-07-01	21603.634
2011-10-01	21144.521
2012-01-01	21989.338
2012-04-01	20881.201
2012-07-01	21467.270
2012-10-01	21760.253
2013-01-01	21077.141
2013-04-01	21501.129
2013-07-01	22163.807
2013-10-01	22532.273
2014-01-01	22604.138
2014-04-01	22534.133
2014-07-01	20836.462
2014-10-01	20366.455
2015-01-01	18680.127
2015-04-01	19354.803
2015-07-01	19472.741
2015-10-01	18930.833
2016-01-01	19917.224
2016-04-01	19613.812
2016-07-01	19761.606
2016-10-01	18811.708
2017-01-01	19224.754
2017-04-01	20522.359
2017-07-01	21258.200
2017-10-01	21688.534
2018-01-01	22457.421