Quarter	Billions of US Dollars
1987-01-01	1.1720
1987-04-01	1.5610
1987-07-01	2.4170
1987-10-01	2.2830
1988-01-01	2.4110
1988-04-01	2.3570
1988-07-01	3.1110
1988-10-01	2.3370
1989-01-01	2.9950
1989-04-01	2.4610
1989-07-01	2.7900
1989-10-01	2.2560
1990-01-01	2.6240
1990-04-01	3.6990
1990-07-01	4.0340
1990-10-01	3.3230
1991-01-01	4.2590
1991-04-01	3.3110
1991-07-01	3.1990
1991-10-01	2.4070
1992-01-01	2.5440
1992-04-01	2.3700
1992-07-01	1.8780
1992-10-01	1.5180
1993-01-01	1.0240
1993-04-01	1.4650
1993-07-01	1.9065
1993-10-01	1.4988
1994-01-01	1.7735
1994-04-01	1.5349
1994-07-01	1.7287
1994-10-01	1.4813
1995-01-01	1.3746
1995-04-01	1.2617
1995-07-01	1.6828
1995-10-01	1.2693
1996-01-01	1.5634
1996-04-01	1.5959
1996-07-01	1.0942
1996-10-01	1.4111
1997-01-01	1.6119
1997-04-01	1.6460
1997-07-01	1.2797
1997-10-01	2.3361
1998-01-01	1.7622
1998-04-01	1.1835
1998-07-01	1.2230
1998-10-01	1.3337
1999-01-01	1.0143
1999-04-01	1.0206
1999-07-01	1.3920
1999-10-01	1.3891
2000-01-01	1.1619
2000-04-01	0.8953
2000-07-01	0.6763
2000-10-01	0.7936
2001-01-01	0.7215
2001-04-01	0.7219
2001-07-01	0.6541
2001-10-01	0.4081
2002-01-01	0.6395
2002-04-01	0.2782
2002-07-01	0.4405
2002-10-01	0.5751
2003-01-01	0.6846
2003-04-01	0.6204
2003-07-01	1.3305
2003-10-01	0.5923
2004-01-01	1.5005
2004-04-01	1.2071
2004-07-01	1.1738
2004-10-01	1.3277
2005-01-01	1.9163
2005-04-01	1.8655
2005-07-01	2.1288
2005-10-01	2.1568
2006-01-01	4.8680
2006-04-01	4.1825
2006-07-01	3.8604
2006-10-01	3.7628
2007-01-01	4.8724
2007-04-01	4.7511
2007-07-01	5.1965
2007-10-01	4.6740
2008-01-01	4.2410
2008-04-01	4.9159
2008-07-01	4.7125
2008-10-01	7.8847
2009-01-01	9.4684
2009-04-01	11.6191
2009-07-01	11.7452
2009-10-01	12.4237
2010-01-01	10.8992
2010-04-01	10.8008
2010-07-01	11.3306
2010-10-01	12.3035
2011-01-01	13.0311
2011-04-01	11.6104
2011-07-01	10.1029
2011-10-01	9.4464
2012-01-01	9.7975
2012-04-01	9.2701
2012-07-01	9.0531
2012-10-01	8.1563
2013-01-01	9.1806
2013-04-01	8.9482
2013-07-01	9.4710
2013-10-01	9.1328
2014-01-01	10.4398
2014-04-01	10.6751
2014-07-01	8.5291
2014-10-01	9.1775
2015-01-01	8.5489
2015-04-01	8.4455