Quarter	Billions of US Dollars
1991-07-01	0.0314
1991-10-01	0.0844
1992-01-01	0.0818
1992-04-01	0.3842
1992-07-01	1.1270
1992-10-01	1.1223
1993-01-01	1.6223
1993-04-01	1.6209
1993-07-01	1.6222
1993-10-01	1.5702
1994-01-01	1.5712
1994-04-01	1.5727
1994-07-01	1.5737
1994-10-01	2.2244
1995-01-01	3.6006
1995-04-01	4.4045
1995-07-01	5.7506
1995-10-01	5.7435
1996-01-01	8.4707
1996-04-01	8.4367
1996-07-01	9.1523
1996-10-01	9.7148
1997-01-01	12.0382
1997-04-01	12.9269
1997-07-01	13.2694
1997-10-01	12.4937
1998-01-01	13.3878
1998-04-01	12.7078
1998-07-01	13.1732
1998-10-01	15.1466
1999-01-01	14.7110
1999-04-01	15.4299
1999-07-01	19.0595
1999-10-01	19.2960
2000-01-01	18.6287
2000-04-01	19.4187
2000-07-01	18.7222
2000-10-01	17.7514
2001-01-01	16.8898
2001-04-01	17.4683
2001-07-01	18.0882
2001-10-01	16.1871
2002-01-01	14.1703
2002-04-01	15.5385
2002-07-01	14.4377
2002-10-01	13.4268
2003-01-01	12.0960
2003-04-01	11.6886
2003-07-01	14.4081
2003-10-01	15.4630
2004-01-01	15.6102
2004-04-01	14.9454
2004-07-01	14.4775
2004-10-01	15.0426
2005-01-01	14.5662
2005-04-01	13.0373
2005-07-01	12.2674
2005-10-01	11.3760
2006-01-01	10.0423
2006-04-01	9.4573
2006-07-01	9.1601
2006-10-01	9.0778
2007-01-01	8.3571
2007-04-01	8.0956
2007-07-01	8.3030
2007-10-01	8.3936
2008-01-01	8.2743
2008-04-01	8.1876
2008-07-01	8.2503
2008-10-01	8.2775
2009-01-01	7.8516
2009-04-01	7.5657
2009-07-01	6.2421
2009-10-01	6.0681
2010-01-01	6.0090
2010-04-01	6.2491
2010-07-01	6.5386
2010-10-01	6.6608
2011-01-01	6.4758
2011-04-01	6.6016
2011-07-01	6.4729
2011-10-01	6.4022
2012-01-01	6.1343
2012-04-01	6.3032
2012-07-01	6.6648
2012-10-01	6.1483
2013-01-01	5.7881
2013-04-01	5.4817
2013-07-01	4.1796
2013-10-01	3.9071
2014-01-01	3.9912
2014-04-01	4.0464
2014-07-01	3.7758
2014-10-01	3.4585
2015-01-01	3.4537
2015-04-01	3.3946