Quarter	Billions of US Dollars
1993-07-01	20.256
1993-10-01	19.610
1994-01-01	18.310
1994-04-01	17.327
1994-07-01	17.346
1994-10-01	15.311
1995-01-01	16.177
1995-04-01	17.738
1995-07-01	18.332
1995-10-01	18.330
1996-01-01	18.610
1996-04-01	20.347
1996-07-01	20.894
1996-10-01	23.291
1997-01-01	24.035
1997-04-01	25.862
1997-07-01	25.823
1997-10-01	29.026
1998-01-01	31.253
1998-04-01	32.635
1998-07-01	38.984
1998-10-01	43.237
1999-01-01	47.241
1999-04-01	50.338
1999-07-01	57.187
1999-10-01	63.338
2000-01-01	65.146
2000-04-01	71.532
2000-07-01	68.939
2000-10-01	73.648
2001-01-01	67.229
2001-04-01	75.675
2001-07-01	77.011
2001-10-01	78.569
2002-01-01	77.231
2002-04-01	84.993
2002-07-01	102.702
2002-10-01	114.172
2003-01-01	136.581
2003-04-01	131.850
2003-07-01	131.235
2003-10-01	142.260
2004-01-01	134.970
2004-04-01	145.649
2004-07-01	145.521
2004-10-01	155.570
2005-01-01	156.425
2005-04-01	146.245
2005-07-01	138.561
2005-10-01	149.550
2006-01-01	150.213
2006-04-01	163.919
2006-07-01	164.019
2006-10-01	168.458
2007-01-01	193.780
2007-04-01	205.636
2007-07-01	212.313
2007-10-01	242.014
2008-01-01	266.859
2008-04-01	282.945
2008-07-01	271.721
2008-10-01	249.250
2009-01-01	237.643
2009-04-01	255.524
2009-07-01	255.125
2009-10-01	249.241
2010-01-01	249.511
2010-04-01	224.767
2010-07-01	268.921
2010-10-01	263.817
2011-01-01	319.591
2011-04-01	327.126
2011-07-01	320.795
2011-10-01	314.932
2012-01-01	312.142
2012-04-01	290.075
2012-07-01	291.333
2012-10-01	302.104
2013-01-01	317.937
2013-04-01	345.633
2013-07-01	340.575
2013-10-01	326.687
2014-01-01	325.352
2014-04-01	291.606
2014-07-01	282.082
2014-10-01	284.418
2015-01-01	258.404
2015-04-01	272.428