Quarter	Billions of US Dollars
1987-01-01	0.0800
1987-04-01	0.0800
1987-07-01	0.0800
1987-10-01	0.0800
1988-01-01	0.0800
1988-04-01	0.0800
1988-07-01	0.0800
1988-10-01	0.0800
1989-01-01	0.0800
1989-04-01	0.0800
1989-07-01	0.0800
1989-10-01	0.0500
1990-01-01	0.0500
1990-04-01	0.0500
1990-07-01	0.0500
1990-10-01	0.0500
1991-01-01	0.0835
1991-04-01	0.0840
1991-07-01	0.0855
1991-10-01	0.0868
1992-01-01	0.0861
1992-04-01	0.0871
1992-07-01	0.0877
1992-10-01	0.0865
1993-01-01	0.0866
1993-04-01	0.0870
1993-07-01	0.0878
1993-10-01	0.3123
1994-01-01	0.3132
1994-04-01	0.3144
1994-07-01	0.3154
1994-10-01	0.3161
1995-01-01	0.3173
1995-04-01	0.3180
1995-07-01	0.3572
1995-10-01	0.3869
1996-01-01	0.3838
1996-04-01	0.7411
1996-07-01	1.1125
1996-10-01	2.1632
1997-01-01	2.4350
1997-04-01	3.0238
1997-07-01	3.0862
1997-10-01	2.9701
1998-01-01	2.8146
1998-04-01	4.5866
1998-07-01	4.5912
1998-10-01	4.6229
1999-01-01	5.4884
1999-04-01	5.0166
1999-07-01	5.4373
1999-10-01	5.2063
2000-01-01	5.5962
2000-04-01	6.1023
2000-07-01	5.9977
2000-10-01	6.4150
2001-01-01	8.0819
2001-04-01	8.0544
2001-07-01	8.1416
2001-10-01	7.4481
2002-01-01	7.3983
2002-04-01	6.0276
2002-07-01	6.0447
2002-10-01	6.1856
2003-01-01	6.2712
2003-04-01	6.4419
2003-07-01	6.6504
2003-10-01	7.2925
2004-01-01	7.9648
2004-04-01	8.5902
2004-07-01	9.0696
2004-10-01	10.1404
2005-01-01	10.4960
2005-04-01	10.8684
2005-07-01	12.8248
2005-10-01	14.0010
2006-01-01	14.4693
2006-04-01	14.9269
2006-07-01	16.0683
2006-10-01	16.1456
2007-01-01	15.9718
2007-04-01	16.4661
2007-07-01	17.0551
2007-10-01	16.7916
2008-01-01	16.8513
2008-04-01	17.6122
2008-07-01	18.4277
2008-10-01	18.0230
2009-01-01	16.3985
2009-04-01	15.4341
2009-07-01	16.4874
2009-10-01	18.5646
2010-01-01	18.8524
2010-04-01	17.5619
2010-07-01	19.4760
2010-10-01	18.7429
2011-01-01	19.7156
2011-04-01	21.9547
2011-07-01	21.2141
2011-10-01	22.3072
2012-01-01	23.5584
2012-04-01	24.0097
2012-07-01	27.5492
2012-10-01	30.2311
2013-01-01	30.6328
2013-04-01	30.6459
2013-07-01	31.0868
2013-10-01	30.5219
2014-01-01	31.4171
2014-04-01	32.0843
2014-07-01	32.8957
2014-10-01	30.7706
2015-01-01	31.2580
2015-04-01	31.9871