Quarter	Billions of US Dollars
1987-01-01	0.4400
1987-04-01	0.4695
1987-07-01	0.4694
1987-10-01	0.4707
1988-01-01	0.5698
1988-04-01	0.6386
1988-07-01	0.7899
1988-10-01	1.0042
1989-01-01	1.0886
1989-04-01	1.2529
1989-07-01	1.7296
1989-10-01	1.5858
1990-01-01	1.6169
1990-04-01	1.4990
1990-07-01	1.5296
1990-10-01	1.4579
1991-01-01	1.3866
1991-04-01	1.3140
1991-07-01	1.1649
1991-10-01	1.0499
1992-01-01	0.9154
1992-04-01	0.8826
1992-07-01	0.8670
1992-10-01	0.8494
1993-01-01	0.9095
1993-04-01	0.7143
1993-07-01	1.1935
1993-10-01	1.1940
1994-01-01	1.1767
1994-04-01	1.1078
1994-07-01	0.8241
1994-10-01	0.8732
1995-01-01	0.9317
1995-04-01	0.9363
1995-07-01	0.9243
1995-10-01	0.9210
1996-01-01	1.0000
1996-04-01	1.0000
1996-07-01	1.0000
1996-10-01	0.9300
1997-01-01	0.9800
1997-04-01	0.9800
1997-07-01	0.9800
1997-10-01	0.9800
1998-01-01	0.9800
1998-04-01	1.0024
1998-07-01	1.1000
1998-10-01	0.9913
1999-01-01	1.0421
1999-04-01	1.0657
1999-07-01	1.9557
1999-10-01	2.0943
2000-01-01	1.8376
2000-04-01	2.4567
2000-07-01	2.5717
2000-10-01	2.5305
2001-01-01	2.6452
2001-04-01	4.0305
2001-07-01	6.0148
2001-10-01	6.2419
2002-01-01	6.7088
2002-04-01	7.3429
2002-07-01	7.8486
2002-10-01	7.9564
2003-01-01	8.0273
2003-04-01	8.9356
2003-07-01	9.6266
2003-10-01	9.9302
2004-01-01	9.7994
2004-04-01	10.8572
2004-07-01	12.8235
2004-10-01	15.3482
2005-01-01	18.0422
2005-04-01	16.6311
2005-07-01	17.1642
2005-10-01	17.5844
2006-01-01	17.4012
2006-04-01	19.4758
2006-07-01	20.1587
2006-10-01	20.4747
2007-01-01	21.4002
2007-04-01	24.6597
2007-07-01	24.0689
2007-10-01	23.4317
2008-01-01	23.4898
2008-04-01	23.0201
2008-07-01	23.1410
2008-10-01	21.3803
2009-01-01	20.2005
2009-04-01	18.5632
2009-07-01	17.5166
2009-10-01	17.2856
2010-01-01	18.1015
2010-04-01	16.9015
2010-07-01	19.4029
2010-10-01	19.6792
2011-01-01	21.8302
2011-04-01	24.2796
2011-07-01	25.3925
2011-10-01	27.4825
2012-01-01	34.7442
2012-04-01	33.2815
2012-07-01	36.0537
2012-10-01	38.3706
2013-01-01	41.5241
2013-04-01	47.6797
2013-07-01	56.5233
2013-10-01	59.9763
2014-01-01	61.8260
2014-04-01	65.7978
2014-07-01	70.3145
2014-10-01	66.0996
2015-01-01	61.5479
2015-04-01	65.0774