Quarter	Billions of US Dollars
2001-10-01	10.375
2002-01-01	11.347
2002-04-01	14.112
2002-07-01	14.967
2002-10-01	16.101
2003-01-01	16.904
2003-04-01	20.236
2003-07-01	21.574
2003-10-01	23.086
2004-01-01	23.498
2004-04-01	23.773
2004-07-01	26.841
2004-10-01	28.658
2005-01-01	29.604
2005-04-01	31.453
2005-07-01	32.269
2005-10-01	35.227
2006-01-01	38.819
2006-04-01	39.095
2006-07-01	40.744
2006-10-01	43.920
2007-01-01	43.712
2007-04-01	47.383
2007-07-01	50.177
2007-10-01	51.739
2008-01-01	55.100
2008-04-01	60.753
2008-07-01	64.020
2008-10-01	56.852
2009-01-01	53.724
2009-04-01	65.690
2009-07-01	72.055
2009-10-01	77.212
2010-01-01	84.983
2010-04-01	89.966
2010-07-01	99.402
2010-10-01	104.007
2011-01-01	112.673
2011-04-01	124.099
2011-07-01	124.141
2011-10-01	131.466
2012-01-01	133.845
2012-04-01	138.798
2012-07-01	142.548
2012-10-01	146.936
2013-01-01	148.329
2013-04-01	153.775
2013-07-01	138.335
2013-10-01	133.599
2014-01-01	145.027
2014-04-01	142.800
2014-07-01	141.330
2014-10-01	145.241
2015-01-01	138.323
2015-04-01	140.917
2015-07-01	129.870
2015-10-01	140.144
2016-01-01	149.983
2016-04-01	152.621
2016-07-01	155.569
2016-10-01	156.638
2017-01-01	161.264
2017-04-01	164.612
2017-07-01	166.074
2017-10-01	170.981
2018-01-01	171.577