Quarter	Billions of US Dollars
1987-01-01	0.81701
1987-04-01	0.82415
1987-07-01	0.77330
1987-10-01	1.00302
1988-01-01	0.90162
1988-04-01	0.88620
1988-07-01	1.01137
1988-10-01	1.06673
1989-01-01	1.06342
1989-04-01	1.14103
1989-07-01	1.16610
1989-10-01	1.25078
1990-01-01	1.24365
1990-04-01	1.27030
1990-07-01	1.33018
1990-10-01	1.35525
1991-01-01	1.50837
1991-04-01	1.45963
1991-07-01	1.44534
1991-10-01	1.52588
1992-01-01	1.42109
1992-04-01	1.52872
1992-07-01	1.60420
1992-10-01	1.31020
1993-01-01	1.15299
1993-04-01	1.04987
1993-07-01	1.15520
1993-10-01	1.10206
1994-01-01	1.30022
1994-04-01	1.34202
1994-07-01	1.38180
1994-10-01	1.19202
1995-01-01	1.29067
1995-04-01	1.31664
1995-07-01	1.24078
1995-10-01	1.20110
1996-01-01	1.32840
1996-04-01	1.21040
1996-07-01	1.20469
1996-10-01	1.09410
1997-01-01	0.99745
1997-04-01	1.17465
1997-07-01	1.20558
1997-10-01	1.18281
1998-01-01	1.17792
1998-04-01	1.15899
1998-07-01	1.17075
1998-10-01	1.22102
1999-01-01	1.30723
1999-04-01	1.30531
1999-07-01	1.34936
1999-10-01	1.17069
2000-01-01	1.16395
2000-04-01	1.08975
2000-07-01	1.08544
2000-10-01	1.07406
2001-01-01	0.90000
2001-04-01	0.90000
2001-07-01	0.90000
2001-10-01	0.90000
2002-01-01	0.90000
2002-04-01	0.90000
2002-07-01	0.65000
2002-10-01	0.65000
2003-01-01	0.50000
2003-04-01	0.50000
2003-07-01	0.50000
2003-10-01	0.80000
2004-01-01	1.10000
2004-04-01	0.85000
2004-07-01	1.10000
2004-10-01	1.35000
2005-01-01	1.35000
2005-04-01	1.37500
2005-07-01	1.49542
2005-10-01	1.49297
2006-01-01	1.69195
2006-04-01	1.68980
2006-07-01	2.03986
2006-10-01	2.57211
2007-01-01	5.13960
2007-04-01	5.60566
2007-07-01	5.49502
2007-10-01	7.51152
2008-01-01	7.75866
2008-04-01	7.69688
2008-07-01	7.68103
2008-10-01	7.48494
2009-01-01	7.10153
2009-04-01	7.13831
2009-07-01	7.10338
2009-10-01	7.58313
2010-01-01	7.37014
2010-04-01	7.60171
2010-07-01	7.57658
2010-10-01	7.60277
2011-01-01	8.20035
2011-04-01	8.48114
2011-07-01	8.44857
2011-10-01	7.56529
2012-01-01	6.35224
2012-04-01	6.06789
2012-07-01	6.59650
2012-10-01	5.05599
2013-01-01	5.58359
2013-04-01	5.75062
2013-07-01	5.77439
2013-10-01	5.74292
2014-01-01	5.76447
2014-04-01	7.17078
2014-07-01	6.93521
2014-10-01	7.03843
2015-01-01	6.53388
2015-04-01	7.26525