Quarter	Billions of US Dollars
1987-01-01	0.0900
1987-04-01	0.0900
1987-07-01	0.0900
1987-10-01	0.0920
1988-01-01	0.1950
1988-04-01	0.1990
1988-07-01	0.1740
1988-10-01	0.1350
1989-01-01	0.1630
1989-04-01	0.1490
1989-07-01	0.0940
1989-10-01	0.1010
1990-01-01	0.0820
1990-04-01	0.0870
1990-07-01	0.0660
1991-01-01	0.0200
1991-04-01	0.0100
1991-10-01	0.2309
1992-01-01	0.2131
1992-04-01	0.2292
1992-07-01	0.2484
1992-10-01	0.2169
1993-01-01	0.2168
1993-04-01	0.2073
1993-07-01	0.3661
1993-10-01	0.3527
1994-01-01	0.3593
1994-04-01	0.3694
1994-07-01	0.3761
1994-10-01	0.3760
1995-01-01	0.4029
1995-04-01	0.4029
1995-07-01	0.3967
1995-10-01	0.3942
1996-01-01	0.3872
1996-04-01	0.6000
1996-07-01	0.4492
1996-10-01	0.3200
1997-01-01	0.4626
1997-04-01	0.5209
1997-07-01	0.5684
1997-10-01	0.5459
1998-01-01	0.5426
1998-04-01	0.5898
1998-07-01	0.6564
1998-10-01	0.7047
1999-01-01	0.8379
1999-04-01	0.9657
1999-07-01	0.9820
1999-10-01	1.4425
2000-01-01	2.0859
2000-04-01	2.7762
2000-07-01	3.0085
2000-10-01	3.5664
2001-01-01	4.1354
2001-04-01	4.6325
2001-07-01	5.0465
2001-10-01	5.2020
2002-01-01	7.1890
2002-04-01	10.3782
2002-07-01	10.5160
2002-10-01	11.1063
2003-01-01	12.4649
2003-04-01	12.4751
2003-07-01	14.7946
2003-10-01	16.9136
2004-01-01	15.0922
2004-04-01	15.0971
2004-07-01	15.1589
2004-10-01	15.3966
2005-01-01	13.7153
2005-04-01	13.0006
2005-07-01	12.2114
2005-10-01	13.5133
2006-01-01	13.8383
2006-04-01	14.8554
2006-07-01	15.2437
2006-10-01	18.5586
2007-01-01	17.8763
2007-04-01	26.3949
2007-07-01	26.5094
2007-10-01	28.5718
2008-01-01	32.6412
2008-04-01	45.0998
2008-07-01	42.8826
2008-10-01	39.9074
2009-01-01	41.8345
2009-04-01	51.3487
2009-07-01	60.2766
2009-10-01	64.9705
2010-01-01	65.9728
2010-04-01	55.9229
2010-07-01	59.6098
2010-10-01	60.8696
2011-01-01	63.8437
2011-04-01	64.8206
2011-07-01	59.2748
2011-10-01	57.7055
2012-01-01	52.4793
2012-04-01	44.4893
2012-07-01	42.4289
2012-10-01	43.7659
2013-01-01	40.5979
2013-04-01	34.0506
2013-07-01	34.6384
2013-10-01	35.4924
2014-01-01	34.0098
2014-04-01	26.7626
2014-07-01	23.0522
2014-10-01	19.6947
2015-01-01	16.7272
2015-04-01	17.2725