Quarter	Billions of US Dollars
2006-01-01	99.021
2006-04-01	101.126
2006-07-01	100.461
2006-10-01	106.659
2007-01-01	108.620
2007-04-01	109.925
2007-07-01	118.875
2007-10-01	120.481
2008-01-01	124.353
2008-04-01	127.361
2008-07-01	133.199
2008-10-01	134.337
2009-01-01	127.475
2009-04-01	130.085
2009-07-01	134.153
2009-10-01	138.723
2010-01-01	144.763
2010-04-01	147.507
2010-07-01	154.532
2010-10-01	161.803
2011-01-01	164.211
2011-04-01	171.379
2011-07-01	169.119
2011-10-01	176.137
2012-01-01	174.296
2012-04-01	181.136
2012-07-01	189.547
2012-10-01	191.880
2013-01-01	191.530
2013-04-01	191.965
2013-07-01	186.117
2013-10-01	193.589
2014-01-01	196.299
2014-04-01	204.440
2014-07-01	202.301
2014-10-01	202.135
2015-01-01	195.718
2015-04-01	199.004
2015-07-01	176.925
2015-10-01	181.665
2016-01-01	200.439
2016-04-01	195.947
2016-07-01	194.802
2016-10-01	187.818
2017-01-01	194.178
2017-04-01	205.311
2017-07-01	209.731
2017-10-01	224.878
2018-01-01	242.457