Quarter	Billions of US Dollars
1993-07-01	73.488
1993-10-01	83.504
1994-01-01	84.545
1994-04-01	127.457
1994-07-01	129.284
1994-10-01	130.354
1995-01-01	136.266
1995-04-01	139.507
1995-07-01	143.381
1995-10-01	146.699
1996-01-01	152.217
1996-04-01	155.509
1996-07-01	164.100
1996-10-01	168.802
1997-01-01	179.697
1997-04-01	187.260
1997-07-01	189.670
1997-10-01	189.867
1998-01-01	193.647
1998-04-01	199.991
1998-07-01	205.233
1998-10-01	185.587
1999-01-01	185.707
1999-04-01	193.892
1999-07-01	199.441
1999-10-01	205.693
2000-01-01	214.784
2000-04-01	214.297
2000-07-01	226.343
2000-10-01	227.468
2001-01-01	233.906
2001-04-01	227.923
2001-07-01	231.763
2001-10-01	224.903
2002-01-01	227.605
2002-04-01	232.052
2002-07-01	231.509
2002-10-01	235.428
2003-01-01	232.002
2003-04-01	232.748
2003-07-01	232.850
2003-10-01	239.681
2004-01-01	242.937
2004-04-01	240.552
2004-07-01	243.215
2004-10-01	254.180
2005-01-01	256.093
2005-04-01	224.221
2005-07-01	224.601
2005-10-01	226.672
2006-01-01	227.870
2006-04-01	213.411
2006-07-01	215.962
2006-10-01	220.345
2007-01-01	220.135
2007-04-01	223.156
2007-07-01	224.398
2007-10-01	226.177
2008-01-01	223.926
2008-04-01	226.346
2008-07-01	218.306
2008-10-01	210.021
2009-01-01	209.281
2009-04-01	207.934
2009-07-01	214.110
2009-10-01	222.567
2010-01-01	215.242
2010-04-01	216.466
2010-07-01	226.569
2010-10-01	230.626
2011-01-01	232.060
2011-04-01	232.508
2011-07-01	235.353
2011-10-01	239.994
2012-01-01	243.652
2012-04-01	243.619
2012-07-01	246.502
2012-10-01	250.550
2013-01-01	249.221
2013-04-01	251.078
2013-07-01	255.799
2013-10-01	265.978
2014-01-01	269.956
2014-04-01	278.896
2014-07-01	282.584
2014-10-01	281.550
2015-01-01	287.182
2015-04-01	291.592