Quarter	Billions of US Dollars
1993-10-01	1.839
1994-01-01	2.109
1994-04-01	2.194
1994-07-01	2.408
1994-10-01	2.413
1995-01-01	2.297
1995-04-01	2.585
1995-07-01	2.863
1995-10-01	4.364
1996-01-01	5.143
1996-04-01	5.620
1996-07-01	5.556
1996-10-01	4.999
1997-01-01	4.968
1997-04-01	5.208
1997-07-01	4.731
1997-10-01	4.130
1998-01-01	4.153
1998-04-01	3.405
1998-07-01	3.311
1998-10-01	2.970
1999-01-01	3.344
1999-04-01	3.075
1999-07-01	3.024
1999-10-01	3.689
2000-01-01	3.578
2000-04-01	3.709
2000-07-01	3.585
2000-10-01	4.049
2001-01-01	3.975
2001-04-01	3.754
2001-07-01	3.175
2001-10-01	2.636
2002-01-01	3.417
2002-04-01	2.801
2002-07-01	2.836
2002-10-01	2.544
2003-01-01	2.301
2003-04-01	1.766
2003-07-01	1.358
2003-10-01	1.844
2004-01-01	2.157
2004-04-01	3.365
2004-07-01	4.210
2004-10-01	4.032
2005-01-01	4.963
2005-04-01	4.515
2005-07-01	4.409
2005-10-01	4.334
2006-01-01	3.267
2006-04-01	3.457
2006-07-01	2.998
2006-10-01	2.602
2007-01-01	2.920
2007-04-01	3.076
2007-07-01	2.359
2007-10-01	2.083
2008-01-01	1.578
2008-04-01	1.374
2008-07-01	1.216
2008-10-01	1.977
2009-01-01	2.759
2009-04-01	1.884
2009-07-01	2.277
2009-10-01	2.959
2010-01-01	2.526
2010-04-01	2.412
2010-07-01	2.221
2010-10-01	3.039
2011-01-01	2.681
2011-04-01	1.960
2011-07-01	2.818
2011-10-01	2.032
2012-01-01	1.976
2012-04-01	1.937
2012-07-01	1.757
2012-10-01	1.972
2013-01-01	1.599
2013-04-01	1.461
2013-07-01	1.604
2013-10-01	1.763
2014-01-01	2.084
2014-04-01	1.819
2014-07-01	1.333
2014-10-01	1.265
2015-01-01	1.073