Quarter	Billions of US Dollars
1987-01-01	0.15300
1987-04-01	0.14900
1987-07-01	0.20000
1987-10-01	0.22700
1988-01-01	0.33600
1988-04-01	0.46700
1988-07-01	0.47400
1988-10-01	0.45700
1989-01-01	0.61300
1989-04-01	0.61200
1989-07-01	0.55700
1989-10-01	0.52500
1990-01-01	0.42700
1990-04-01	0.37300
1990-07-01	0.53600
1990-10-01	0.41000
1991-01-01	0.57000
1991-04-01	0.31600
1991-07-01	0.31400
1991-10-01	0.31600
1992-01-01	0.46600
1992-04-01	0.49100
1992-07-01	0.53600
1992-10-01	0.60100
1993-01-01	0.50400
1993-04-01	0.56900
1993-07-01	0.59271
1993-10-01	0.57017
1994-01-01	0.78218
1994-04-01	0.82179
1994-07-01	0.95501
1994-10-01	0.76455
1995-01-01	0.75551
1995-04-01	0.69364
1995-07-01	0.82808
1995-10-01	0.77193
1996-01-01	0.60680
1996-04-01	0.60951
1996-07-01	0.81296
1996-10-01	0.80335
1997-01-01	1.16090
1997-04-01	1.66193
1997-07-01	1.12379
1997-10-01	0.78751
1998-01-01	0.80932
1998-04-01	0.54328
1998-07-01	0.85390
1998-10-01	0.81209
1999-01-01	0.83217
1999-04-01	0.32690
1999-07-01	0.20911
1999-10-01	0.13287
2000-01-01	0.04962
2000-04-01	0.54462
2000-07-01	0.53820
2000-10-01	0.55120
2001-01-01	0.55450
2001-04-01	0.70150
2001-07-01	0.73997
2001-10-01	0.74845
2002-01-01	0.72279
2002-04-01	0.88371
2002-07-01	0.90618
2002-10-01	0.89354
2003-01-01	0.91918
2003-04-01	0.27380
2003-07-01	0.27561
2003-10-01	0.29812
2004-01-01	0.33640
2004-04-01	0.08308
2004-07-01	0.07309
2004-10-01	0.05017
2005-01-01	0.07244
2005-04-01	0.06755
2005-07-01	0.06768
2005-10-01	0.11287
2006-01-01	0.37374
2006-04-01	0.38949
2006-07-01	0.45274
2006-10-01	0.44704
2007-01-01	0.21525
2007-04-01	0.19920
2007-07-01	0.12232
2007-10-01	0.17690
2008-01-01	0.29005
2008-04-01	0.27503
2008-07-01	0.29294
2008-10-01	0.49749
2009-01-01	0.30335
2009-04-01	0.29332
2009-07-01	0.43610
2009-10-01	0.26433
2010-01-01	0.32172
2010-04-01	0.38393
2010-07-01	0.46521
2010-10-01	0.80215
2011-01-01	0.92542
2011-04-01	1.47676
2011-07-01	2.21294
2011-10-01	1.77354
2012-01-01	2.81133
2012-04-01	3.21514
2012-07-01	2.63177
2012-10-01	2.21875
2013-01-01	2.65161
2013-04-01	3.38461
2013-07-01	3.37417
2013-10-01	4.50714
2014-01-01	6.18198
2014-04-01	7.14434
2014-07-01	6.50964
2014-10-01	6.14225
2015-01-01	7.21942
2015-04-01	5.47643