Quarter	Billions of US Dollars
1987-01-01	0.3359
1987-04-01	0.3307
1987-07-01	0.3298
1987-10-01	0.3351
1988-01-01	0.4761
1988-04-01	0.4840
1988-07-01	0.4436
1988-10-01	0.4362
1989-01-01	0.4136
1989-04-01	0.3960
1989-07-01	0.4889
1989-10-01	0.5145
1990-01-01	0.4616
1990-04-01	0.3792
1990-07-01	0.3718
1990-10-01	0.3868
1991-01-01	0.3464
1991-04-01	0.3368
1991-07-01	0.3309
1991-10-01	0.3587
1992-01-01	0.3332
1992-04-01	0.3567
1992-07-01	0.3826
1992-10-01	0.3451
1993-01-01	0.2856
1993-04-01	0.2823
1993-07-01	0.2921
1993-10-01	0.2743
1994-01-01	0.4880
1994-04-01	0.5090
1994-07-01	0.4183
1994-10-01	0.4883
1995-01-01	0.9775
1995-04-01	1.0625
1995-07-01	1.3024
1995-10-01	1.2623
1996-01-01	1.2330
1996-04-01	1.2121
1996-07-01	1.3381
1996-10-01	1.3132
1997-01-01	1.2497
1997-04-01	1.3292
1997-07-01	1.7606
1997-10-01	1.7138
1998-01-01	1.7033
1998-04-01	1.6459
1998-07-01	1.6441
1998-10-01	1.7704
1999-01-01	1.7211
1999-04-01	1.7123
1999-07-01	1.9536
1999-10-01	1.9894
2000-01-01	1.7096
2000-04-01	1.8408
2000-07-01	2.2725
2000-10-01	2.1688
2001-01-01	2.5205
2001-04-01	2.4806
2001-07-01	2.4018
2001-10-01	2.2632
2002-01-01	2.0487
2002-04-01	2.8592
2002-07-01	3.7496
2002-10-01	4.2154
2003-01-01	4.6180
2003-04-01	4.7067
2003-07-01	4.8570
2003-10-01	5.7566
2004-01-01	5.4564
2004-04-01	6.0072
2004-07-01	5.8730
2004-10-01	7.6882
2005-01-01	7.5222
2005-04-01	10.0972
2005-07-01	9.9253
2005-10-01	9.8150
2006-01-01	14.1788
2006-04-01	15.2858
2006-07-01	15.5805
2006-10-01	21.7614
2007-01-01	22.5149
2007-04-01	23.9965
2007-07-01	23.8058
2007-10-01	25.3862
2008-01-01	21.2004
2008-04-01	22.6210
2008-07-01	22.3714
2008-10-01	22.0342
2009-01-01	21.7831
2009-04-01	22.5067
2009-07-01	22.7549
2009-10-01	18.1650
2010-01-01	17.8383
2010-04-01	15.4725
2010-07-01	20.3381
2010-10-01	20.4958
2011-01-01	20.0960
2011-04-01	20.3768
2011-07-01	19.5130
2011-10-01	20.1210
2012-01-01	20.5076
2012-04-01	18.8416
2012-07-01	20.9857
2012-10-01	26.2535
2013-01-01	26.7709
2013-04-01	26.0020
2013-07-01	26.4738
2013-10-01	27.2771
2014-01-01	27.5541
2014-04-01	29.0900
2014-07-01	29.8158
2014-10-01	31.0474
2015-01-01	31.5348
2015-04-01	35.2829