Quarter	Billions of US Dollars
1987-01-01	0.6229
1987-04-01	0.6106
1987-07-01	0.5811
1987-10-01	0.6188
1988-01-01	0.4795
1988-04-01	0.4584
1988-07-01	0.4495
1988-10-01	0.4608
1989-01-01	0.3686
1989-04-01	0.3659
1989-07-01	0.3703
1989-10-01	0.3802
1990-01-01	0.3582
1990-04-01	0.4774
1990-07-01	0.5874
1990-10-01	0.4920
1991-01-01	0.4088
1991-04-01	0.5265
1991-07-01	0.5369
1991-10-01	0.7885
1992-01-01	0.9006
1992-04-01	0.9471
1992-07-01	1.0608
1992-10-01	1.4384
1993-01-01	1.4374
1993-04-01	1.5570
1993-07-01	2.3189
1993-10-01	3.0027
1994-01-01	3.3390
1994-04-01	4.2586
1994-07-01	5.0327
1994-10-01	5.2406
1995-01-01	4.6539
1995-04-01	4.8600
1995-07-01	5.3256
1995-10-01	5.0035
1996-01-01	5.0766
1996-04-01	5.3529
1996-07-01	5.1464
1996-10-01	4.7596
1997-01-01	4.5678
1997-04-01	4.8877
1997-07-01	5.0491
1997-10-01	5.0490
1998-01-01	4.8240
1998-04-01	3.9604
1998-07-01	3.7317
1998-10-01	4.9685
1999-01-01	5.9793
1999-04-01	5.9229
1999-07-01	7.2584
1999-10-01	7.3806
2000-01-01	8.2184
2000-04-01	7.9372
2000-07-01	8.4712
2000-10-01	8.0799
2001-01-01	8.8787
2001-04-01	8.6871
2001-07-01	9.0776
2001-10-01	8.8687
2002-01-01	10.5257
2002-04-01	10.2401
2002-07-01	10.0821
2002-10-01	10.9813
2003-01-01	12.1072
2003-04-01	13.8057
2003-07-01	14.7251
2003-10-01	13.9187
2004-01-01	14.7543
2004-04-01	16.2092
2004-07-01	18.7915
2004-10-01	19.0721
2005-01-01	19.6767
2005-04-01	18.6133
2005-07-01	18.6264
2005-10-01	19.2647
2006-01-01	19.3692
2006-04-01	19.7296
2006-07-01	19.8747
2006-10-01	21.0872
2007-01-01	23.1259
2007-04-01	23.8766
2007-07-01	21.9344
2007-10-01	23.6886
2008-01-01	23.2069
2008-04-01	25.2414
2008-07-01	24.4287
2008-10-01	22.6068
2009-01-01	21.2546
2009-04-01	21.7941
2009-07-01	21.4008
2009-10-01	22.7631
2010-01-01	22.8261
2010-04-01	18.9487
2010-07-01	19.5764
2010-10-01	16.9732
2011-01-01	17.2560
2011-04-01	17.3542
2011-07-01	16.8456
2011-10-01	16.5786
2012-01-01	16.5805
2012-04-01	16.0077
2012-07-01	16.2028
2012-10-01	16.9397
2013-01-01	16.5919
2013-04-01	16.5893
2013-07-01	17.1807
2013-10-01	15.3641
2014-01-01	15.5462
2014-04-01	17.4454
2014-07-01	17.4435
2014-10-01	17.2657
2015-01-01	16.9187
2015-04-01	17.0565