Quarter	Billions of US Dollars
1987-01-01	0.10288
1987-04-01	0.10204
1987-07-01	0.10249
1987-10-01	0.12146
1988-01-01	0.11962
1988-04-01	0.11329
1988-07-01	0.11148
1988-10-01	0.11919
1989-01-01	0.11359
1989-04-01	0.10409
1989-07-01	0.10768
1989-10-01	0.10457
1990-01-01	0.09542
1990-04-01	0.09810
1990-07-01	0.10885
1990-10-01	0.11161
1991-01-01	0.10638
1991-04-01	0.10877
1991-07-01	0.11291
1991-10-01	0.11981
1992-01-01	0.11261
1992-04-01	0.11952
1992-07-01	0.12584
1992-10-01	0.12024
1993-01-01	0.12892
1993-04-01	0.14052
1993-07-01	0.14265
1993-10-01	0.23411
1994-01-01	0.24542
1994-04-01	0.25144
1994-07-01	0.25236
1994-10-01	0.20026
1995-01-01	0.21192
1995-04-01	0.21820
1995-07-01	0.25086
1995-10-01	0.39862
1996-01-01	0.44705
1996-04-01	0.42000
1996-07-01	0.57000
1996-10-01	0.57000
1997-01-01	0.57000
1997-04-01	0.57000
1997-07-01	0.82000
1997-10-01	0.86000
1998-01-01	0.86000
1998-04-01	0.86000
1998-07-01	0.86000
1998-10-01	0.86000
1999-01-01	0.86000
1999-04-01	0.86000
1999-07-01	0.96000
1999-10-01	0.96000
2000-01-01	0.96000
2000-04-01	0.96000
2000-07-01	0.96000
2000-10-01	0.96000
2001-01-01	0.96000
2001-04-01	0.96000
2001-07-01	0.81000
2001-10-01	0.81000
2002-01-01	0.81000
2002-04-01	0.91000
2002-07-01	0.81000
2002-10-01	0.66000
2003-01-01	0.59000
2003-04-01	0.59000
2003-07-01	0.59000
2003-10-01	0.59000
2004-01-01	0.59000
2004-04-01	0.49000
2004-07-01	0.30000
2004-10-01	0.30000
2005-01-01	0.42110
2005-04-01	0.41775
2005-07-01	0.91489
2005-10-01	0.91020
2006-01-01	0.91073
2006-04-01	0.91309
2006-07-01	0.81036
2006-10-01	0.90929
2007-01-01	1.03799
2007-04-01	1.02722
2007-07-01	1.04337
2007-10-01	1.04561
2008-01-01	1.07972
2008-04-01	1.06316
2008-07-01	1.06846
2008-10-01	2.10854
2009-01-01	2.08542
2009-04-01	2.09182
2009-07-01	2.01191
2009-10-01	2.00415
2010-01-01	1.86086
2010-04-01	1.86930
2010-07-01	1.37986
2010-10-01	1.38416
2011-01-01	2.08044
2011-04-01	2.53583
2011-07-01	2.54575
2011-10-01	2.44300
2012-01-01	2.47146
2012-04-01	2.45934
2012-07-01	2.46379
2012-10-01	2.76820
2013-01-01	2.76006
2013-04-01	3.23913
2013-07-01	3.24934
2013-10-01	3.25096
2014-01-01	3.75391
2014-04-01	3.75487
2014-07-01	3.28373
2014-10-01	3.26709
2015-01-01	3.45986
2015-04-01	3.47481