Quarter	Billions of US Dollars
1988-01-01	0.0980
1988-04-01	0.0800
1988-07-01	0.0800
1988-10-01	0.0900
1989-01-01	0.0900
1989-04-01	0.0900
1989-07-01	0.0900
1989-10-01	0.0800
1990-01-01	0.0800
1990-04-01	0.0400
1990-07-01	0.0400
1990-10-01	0.1900
1991-01-01	0.1900
1991-04-01	0.1900
1991-07-01	0.1900
1991-10-01	0.1500
1992-01-01	0.1500
1992-04-01	0.1500
1992-07-01	0.1500
1992-10-01	0.1500
1993-01-01	0.1500
1993-04-01	0.0750
1993-07-01	0.2142
1993-10-01	0.1651
1994-01-01	0.2131
1994-04-01	0.1850
1994-07-01	0.1847
1994-10-01	0.1865
1995-01-01	0.1798
1995-04-01	0.1791
1995-07-01	0.1500
1996-01-01	0.0500
1996-04-01	0.1836
1996-07-01	0.3082
1996-10-01	0.4946
1997-01-01	0.5567
1997-04-01	0.4905
1997-07-01	0.3612
1997-10-01	0.2525
1998-01-01	0.1484
1998-04-01	0.3308
1998-07-01	0.3634
1998-10-01	0.3434
1999-01-01	0.2497
1999-04-01	0.1975
1999-07-01	0.3970
1999-10-01	0.2681
2000-01-01	0.1549
2000-04-01	0.1605
2000-07-01	0.1154
2000-10-01	0.1475
2001-01-01	0.1565
2001-04-01	0.3006
2001-07-01	0.0592
2001-10-01	0.0215
2002-01-01	0.0990
2002-04-01	0.1327
2002-07-01	0.1435
2002-10-01	0.1647
2003-01-01	0.1592
2003-04-01	0.3065
2003-07-01	0.3237
2003-10-01	0.4700
2004-01-01	0.6574
2004-04-01	0.5280
2004-07-01	0.6322
2004-10-01	1.0565
2005-01-01	1.1880
2005-04-01	0.6847
2005-07-01	1.5195
2005-10-01	1.5023
2006-01-01	0.5412
2006-04-01	0.8638
2006-07-01	0.8499
2006-10-01	0.7445
2007-01-01	0.7644
2007-04-01	1.1094
2007-07-01	1.2147
2007-10-01	0.7272
2008-01-01	0.8879
2008-04-01	1.5371
2008-07-01	1.1189
2008-10-01	0.6785
2009-01-01	0.6411
2009-04-01	0.6560
2009-07-01	1.0808
2009-10-01	0.9262
2010-01-01	1.3130
2010-04-01	1.0799
2010-07-01	1.4394
2010-10-01	1.3599
2011-01-01	2.8763
2011-04-01	4.8804
2011-07-01	8.6203
2011-10-01	10.2080
2012-01-01	10.2662
2012-04-01	9.2339
2012-07-01	7.0358
2012-10-01	5.8245
2013-01-01	7.2351
2013-04-01	10.7373
2013-07-01	15.8667
2013-10-01	19.2444
2014-01-01	18.2520
2014-04-01	19.2962
2014-07-01	19.7034
2014-10-01	17.6064
2015-01-01	14.0901
2015-04-01	15.6215