Quarter	Billions of US Dollars
2007-04-01	115.486
2007-07-01	124.219
2007-10-01	127.882
2008-01-01	130.384
2008-04-01	125.637
2008-07-01	118.966
2008-10-01	117.352
2009-01-01	111.074
2009-04-01	116.474
2009-07-01	118.463
2009-10-01	121.651
2010-01-01	130.445
2010-04-01	127.649
2010-07-01	140.690
2010-10-01	151.119
2011-01-01	156.919
2011-04-01	158.844
2011-07-01	147.926
2011-10-01	142.815
2012-01-01	153.663
2012-04-01	143.806
2012-07-01	154.906
2012-10-01	156.912
2013-01-01	165.445
2013-04-01	156.632
2013-07-01	153.648
2013-10-01	161.388
2014-01-01	168.586
2014-04-01	172.219
2014-07-01	171.833
2014-10-01	181.266
2015-01-01	186.532
2015-04-01	190.730
2015-07-01	191.290
2015-10-01	200.941
2016-01-01	210.134
2016-04-01	212.882
2016-07-01	225.373
2016-10-01	222.204
2017-01-01	249.577
2017-04-01	253.810
2017-07-01	268.795
2017-10-01	281.041
2018-01-01	292.613