Quarter	Billions of US Dollars
1993-07-01	0.01411
1993-10-01	0.04731
1994-01-01	0.03546
1994-04-01	0.03719
1994-07-01	0.03888
1995-01-01	0.11851
1995-04-01	0.11729
1995-07-01	0.23343
1995-10-01	0.23207
1996-01-01	0.19493
1996-04-01	0.18538
1996-07-01	0.07956
1996-10-01	0.07427
1997-01-01	0.00600
1997-04-01	0.06586
1997-07-01	0.06612
1997-10-01	0.06600
1998-01-01	0.05762
1998-10-01	0.07265
1999-01-01	0.13448
1999-04-01	0.12882
1999-07-01	0.13356
1999-10-01	0.06252
2000-04-01	0.09223
2000-07-01	0.08641
2000-10-01	0.09166
2001-01-01	0.08662
2001-07-01	0.06205
2001-10-01	0.05962
2002-01-01	0.11884
2002-04-01	0.20336
2002-07-01	0.13484
2002-10-01	0.14422
2003-01-01	0.14887
2003-04-01	0.07500
2003-07-01	0.07500
2003-10-01	0.07500
2004-10-01	0.22093
2005-01-01	0.20917
2005-04-01	0.58370
2005-07-01	0.58131
2005-10-01	0.46653
2006-01-01	0.46968
2006-04-01	0.09172
2006-07-01	0.09351
2006-10-01	0.17524
2007-01-01	0.17515
2007-04-01	0.17461
2007-07-01	0.35146
2007-10-01	0.17770
2008-01-01	0.29345
2008-04-01	0.38663
2008-07-01	0.16932
2008-10-01	0.30623
2009-01-01	0.18118
2009-04-01	0.37953
2009-07-01	0.39799
2009-10-01	0.25187
2010-01-01	0.43371
2010-04-01	0.43470
2010-07-01	0.48304
2010-10-01	0.50021
2011-01-01	0.29515
2011-04-01	0.59923
2011-07-01	0.55469
2011-10-01	0.53141
2012-01-01	0.55365
2012-07-01	0.26724
2012-10-01	0.27275
2013-01-01	0.52515
2013-04-01	0.53124
2013-07-01	0.27618
2013-10-01	0.28043
2014-10-01	0.20220
2015-01-01	0.20559
2015-04-01	0.42983