Quarter	Billions of US Dollars
1993-07-01	1.7254
1993-10-01	1.3366
1994-01-01	0.8410
1994-04-01	0.4993
1994-07-01	1.0324
1994-10-01	1.3494
1995-01-01	2.3004
1995-04-01	2.5038
1995-07-01	2.0768
1995-10-01	1.7673
1996-01-01	0.8200
1996-04-01	0.9094
1996-07-01	1.0360
1996-10-01	2.1403
1997-01-01	2.8955
1997-04-01	3.8777
1997-07-01	3.7434
1997-10-01	4.0104
1998-01-01	3.8463
1998-04-01	4.1163
1998-07-01	4.6883
1998-10-01	5.1674
1999-01-01	7.2211
1999-04-01	5.6802
1999-07-01	7.6970
1999-10-01	6.9751
2000-01-01	5.0405
2000-04-01	3.7649
2000-07-01	4.7752
2000-10-01	7.0998
2001-01-01	7.2555
2001-04-01	8.4507
2001-07-01	7.9343
2001-10-01	6.2877
2002-01-01	6.1577
2002-04-01	6.3990
2002-07-01	7.2378
2002-10-01	7.1264
2003-01-01	7.4532
2003-04-01	6.1917
2003-07-01	5.7674
2003-10-01	4.9080
2004-01-01	4.6748
2004-04-01	5.5343
2004-07-01	5.1262
2004-10-01	6.2604
2005-01-01	6.8251
2005-04-01	6.3895
2005-07-01	6.4645
2005-10-01	4.6107
2006-01-01	6.1596
2006-04-01	8.0763
2006-07-01	8.2904
2006-10-01	8.7431
2007-01-01	7.3110
2007-04-01	5.6987
2007-07-01	5.3737
2007-10-01	5.5258
2008-01-01	6.0121
2008-04-01	6.8451
2008-07-01	6.5628
2008-10-01	7.2006
2009-01-01	7.2648
2009-04-01	6.8450
2009-07-01	6.0663
2009-10-01	5.5082
2010-01-01	6.9245
2010-04-01	5.6740
2010-07-01	8.4325
2010-10-01	9.5016
2011-01-01	11.4273
2011-04-01	15.6250
2011-07-01	16.6697
2011-10-01	17.9975
2012-01-01	23.3547
2012-04-01	24.9698
2012-07-01	27.2851
2012-10-01	28.8674
2013-01-01	32.8891
2013-04-01	40.2202
2013-07-01	44.0930
2013-10-01	48.2912
2014-01-01	54.8186
2014-04-01	59.8780
2014-07-01	62.0719
2014-10-01	60.0779
2015-01-01	63.1736
2015-04-01	58.6983