Quarter	Billions of US Dollars
1991-04-01	0.08107
1991-07-01	0.08763
1991-10-01	0.09354
1992-01-01	0.08696
1992-04-01	0.09490
1992-07-01	0.08913
1992-10-01	0.07560
1993-01-01	0.07517
1993-04-01	0.07544
1993-07-01	0.07553
1993-10-01	0.07406
1994-01-01	0.07411
1994-04-01	0.07701
1994-07-01	0.07898
1994-10-01	0.08813
1995-01-01	0.11065
1995-04-01	0.10970
1995-07-01	0.11400
1995-10-01	0.10250
1996-01-01	0.10127
1996-04-01	0.10243
1996-07-01	0.10311
1996-10-01	0.10990
1997-01-01	0.08646
1997-04-01	0.08817
1997-07-01	0.08066
1997-10-01	0.08269
1998-01-01	0.08400
1998-04-01	0.08314
1998-07-01	0.08477
1998-10-01	0.08318
1999-01-01	0.08807
1999-04-01	0.13788
1999-07-01	0.11932
1999-10-01	0.16870
2000-01-01	0.16252
2000-04-01	0.25013
2000-07-01	0.24258
2000-10-01	0.80021
2001-01-01	1.10192
2001-04-01	2.38021
2001-07-01	3.48976
2001-10-01	3.74352
2002-01-01	3.93240
2002-04-01	5.01212
2002-07-01	3.65685
2002-10-01	4.15969
2003-01-01	4.14819
2003-04-01	4.41623
2003-07-01	4.74186
2003-10-01	5.13147
2004-01-01	4.92422
2004-04-01	4.87074
2004-07-01	4.52404
2004-10-01	4.31750
2005-01-01	4.27043
2005-04-01	4.08386
2005-07-01	4.25291
2005-10-01	4.19330
2006-01-01	4.29708
2006-04-01	4.38679
2006-07-01	3.47138
2006-10-01	3.46840
2007-01-01	3.25116
2007-04-01	3.28048
2007-07-01	4.07814
2007-10-01	3.74798
2008-01-01	3.88038
2008-04-01	3.86670
2008-07-01	3.26761
2008-10-01	3.05388
2009-01-01	2.86689
2009-04-01	2.92830
2009-07-01	2.90578
2009-10-01	2.77802
2010-01-01	2.45299
2010-04-01	2.32910
2010-07-01	2.39971
2010-10-01	2.20904
2011-01-01	2.07142
2011-04-01	1.90530
2011-07-01	1.78306
2011-10-01	1.72981
2012-01-01	1.60160
2012-04-01	1.46364
2012-07-01	1.49431
2012-10-01	1.47260
2013-01-01	1.43569
2013-04-01	0.98759
2013-07-01	1.01647
2013-10-01	1.02649
2014-01-01	1.03054
2014-04-01	1.03572
2014-07-01	0.98775
2014-10-01	0.91282
2015-01-01	0.76884
2015-04-01	0.79411