Quarter	Billions of US Dollars
1987-01-01	0.18700
1987-04-01	0.23500
1987-07-01	0.25200
1987-10-01	0.36900
1988-01-01	1.19100
1988-04-01	1.54100
1988-07-01	1.66600
1988-10-01	1.53400
1989-01-01	0.92800
1989-04-01	0.86200
1989-07-01	1.05000
1989-10-01	0.96600
1990-01-01	0.71000
1990-04-01	1.15200
1990-07-01	0.99900
1990-10-01	0.96500
1991-01-01	0.76000
1991-04-01	0.95200
1991-07-01	0.84900
1991-10-01	0.92100
1992-01-01	1.86300
1992-04-01	1.83900
1992-07-01	0.94700
1992-10-01	0.89900
1993-01-01	0.89600
1993-04-01	0.94400
1993-07-01	1.10379
1993-10-01	1.18005
1994-01-01	1.42819
1994-04-01	1.36237
1994-07-01	1.41355
1994-10-01	1.26568
1995-01-01	1.45787
1995-04-01	1.47881
1995-07-01	0.99993
1995-10-01	1.21157
1996-01-01	0.94096
1996-04-01	2.34413
1996-07-01	1.81722
1996-10-01	1.97829
1997-01-01	2.34226
1997-04-01	3.25123
1997-07-01	2.51261
1997-10-01	3.72072
1998-01-01	3.53648
1998-04-01	3.12398
1998-07-01	4.04687
1998-10-01	4.95107
1999-01-01	4.46084
1999-04-01	6.73227
1999-07-01	5.23298
1999-10-01	5.30142
2000-01-01	5.01865
2000-04-01	3.39976
2000-07-01	3.49350
2000-10-01	3.70778
2001-01-01	3.13230
2001-04-01	2.19595
2001-07-01	1.94223
2001-10-01	1.49814
2002-01-01	2.01185
2002-04-01	1.75793
2002-07-01	1.67160
2002-10-01	3.22857
2003-01-01	3.38076
2003-04-01	3.31579
2003-07-01	2.85061
2003-10-01	3.97047
2004-01-01	3.59469
2004-04-01	3.15300
2004-07-01	3.10286
2004-10-01	2.05532
2005-01-01	1.54333
2005-04-01	1.91334
2005-07-01	1.12992
2005-10-01	1.50191
2006-01-01	0.61322
2006-04-01	1.35800
2006-07-01	1.27336
2006-10-01	1.22511
2007-01-01	1.29434
2007-04-01	2.11477
2007-07-01	1.59628
2007-10-01	1.43685
2008-01-01	1.70555
2008-04-01	1.43673
2008-07-01	2.00819
2008-10-01	2.98080
2009-01-01	2.55893
2009-04-01	2.94433
2009-07-01	2.89852
2009-10-01	1.80777
2010-01-01	1.38598
2010-04-01	1.06746
2010-07-01	1.20910
2010-10-01	0.88664
2011-01-01	0.77387
2011-04-01	1.49219
2011-07-01	1.48995
2011-10-01	1.30047
2012-01-01	1.64212
2012-04-01	3.88563
2012-07-01	3.06163
2012-10-01	4.23494
2013-01-01	3.84873
2013-04-01	3.22443
2013-07-01	3.52700
2013-10-01	3.64657
2014-01-01	5.23617
2014-04-01	7.28988
2014-07-01	7.75112
2014-10-01	5.11536
2015-01-01	4.79478
2015-04-01	5.21438