Quarter	Billions of US Dollars
2001-10-01	33.732
2002-01-01	33.767
2002-04-01	35.684
2002-07-01	35.778
2002-10-01	37.286
2003-01-01	37.737
2003-04-01	37.874
2003-07-01	38.095
2003-10-01	39.716
2004-01-01	37.771
2004-04-01	40.157
2004-07-01	40.882
2004-10-01	42.857
2005-01-01	44.410
2005-04-01	45.782
2005-07-01	45.959
2005-10-01	46.837
2006-01-01	47.526
2006-04-01	50.173
2006-07-01	52.244
2006-10-01	56.750
2007-01-01	56.626
2007-04-01	54.336
2007-07-01	57.584
2007-10-01	66.093
2008-01-01	69.927
2008-04-01	76.089
2008-07-01	80.865
2008-10-01	75.158
2009-01-01	70.051
2009-04-01	75.969
2009-07-01	79.945
2009-10-01	85.562
2010-01-01	80.188
2010-04-01	92.104
2010-07-01	92.401
2010-10-01	102.190
2011-01-01	103.426
2011-04-01	112.286
2011-07-01	119.333
2011-10-01	129.010
2012-01-01	138.648
2012-04-01	147.239
2012-07-01	150.686
2012-10-01	162.489
2013-01-01	163.363
2013-04-01	172.981
2013-07-01	167.928
2013-10-01	170.778
2014-01-01	179.651
2014-04-01	184.836
2014-07-01	189.309
2014-10-01	191.687
2015-01-01	185.068
2015-04-01	189.445
2015-07-01	182.119
2015-10-01	198.901
2016-01-01	202.951
2016-04-01	210.688
2016-07-01	214.658
2016-10-01	216.765
2017-01-01	214.470
2017-04-01	221.083
2017-07-01	218.839
2017-10-01	224.248
2018-01-01	221.020