Quarter	Billions of US Dollars
2006-01-01	84.817
2006-04-01	86.742
2006-07-01	88.539
2006-10-01	94.189
2007-01-01	97.130
2007-04-01	99.047
2007-07-01	102.799
2007-10-01	108.237
2008-01-01	113.981
2008-04-01	114.374
2008-07-01	111.534
2008-10-01	113.711
2009-01-01	109.261
2009-04-01	115.959
2009-07-01	121.031
2009-10-01	125.936
2010-01-01	136.525
2010-04-01	142.227
2010-07-01	154.069
2010-10-01	159.700
2011-01-01	166.649
2011-04-01	172.127
2011-07-01	167.484
2011-10-01	174.134
2012-01-01	185.288
2012-04-01	184.003
2012-07-01	196.239
2012-10-01	202.398
2013-01-01	205.082
2013-04-01	206.338
2013-07-01	205.698
2013-10-01	211.311
2014-01-01	217.292
2014-04-01	226.515
2014-07-01	226.557
2014-10-01	217.761
2015-01-01	209.962
2015-04-01	209.809
2015-07-01	182.906
2015-10-01	190.295
2016-01-01	213.848
2016-04-01	210.176
2016-07-01	205.362
2016-10-01	192.609
2017-01-01	196.884
2017-04-01	205.253
2017-07-01	211.335
2017-10-01	224.453
2018-01-01	237.813