Quarter	Billions of US Dollars
1987-01-01	0.7036
1987-04-01	0.7380
1987-07-01	0.8405
1987-10-01	0.9148
1988-01-01	1.1603
1988-04-01	1.2157
1988-07-01	1.3805
1988-10-01	1.9200
1989-01-01	2.2831
1989-04-01	2.6925
1989-07-01	2.7505
1989-10-01	2.7196
1990-01-01	2.7668
1990-04-01	3.3886
1990-07-01	3.9758
1990-10-01	4.6173
1991-01-01	4.6520
1991-04-01	4.7625
1991-07-01	5.4624
1991-10-01	5.4339
1992-01-01	5.0290
1992-04-01	5.8947
1992-07-01	5.9155
1992-10-01	5.9836
1993-01-01	5.8338
1993-04-01	5.5329
1993-07-01	7.8974
1993-10-01	7.1066
1994-01-01	8.0341
1994-04-01	7.6862
1994-07-01	7.9005
1994-10-01	8.1551
1995-01-01	8.0988
1995-04-01	7.6459
1995-07-01	7.7612
1995-10-01	7.1372
1996-01-01	7.9927
1996-04-01	8.7490
1996-07-01	8.5039
1996-10-01	9.2151
1997-01-01	10.4662
1997-04-01	10.8583
1997-07-01	10.3349
1997-10-01	10.7086
1998-01-01	9.7049
1998-04-01	8.7325
1998-07-01	9.1193
1998-10-01	9.4394
1999-01-01	8.0701
1999-04-01	8.0334
1999-07-01	9.2596
1999-10-01	8.8528
2000-01-01	7.6741
2000-04-01	7.9225
2000-07-01	7.3821
2000-10-01	7.3540
2001-01-01	6.5895
2001-04-01	6.6114
2001-07-01	6.4784
2001-10-01	6.5666
2002-01-01	7.5239
2002-04-01	8.7294
2002-07-01	8.3358
2002-10-01	9.0062
2003-01-01	9.3035
2003-04-01	9.9457
2003-07-01	9.8674
2003-10-01	10.7407
2004-01-01	11.2458
2004-04-01	12.6236
2004-07-01	13.3375
2004-10-01	14.9638
2005-01-01	15.1360
2005-04-01	14.7203
2005-07-01	15.2285
2005-10-01	13.8356
2006-01-01	15.4861
2006-04-01	16.3933
2006-07-01	16.0734
2006-10-01	16.3098
2007-01-01	15.6085
2007-04-01	15.6085
2007-07-01	16.2910
2007-10-01	15.6940
2008-01-01	17.2227
2008-04-01	17.2592
2008-07-01	17.2139
2008-10-01	17.5879
2009-01-01	16.5977
2009-04-01	19.6220
2009-07-01	20.9172
2009-10-01	20.7974
2010-01-01	21.4749
2010-04-01	21.1456
2010-07-01	24.1966
2010-10-01	26.4162
2011-01-01	29.7391
2011-04-01	31.2391
2011-07-01	29.4176
2011-10-01	30.3900
2012-01-01	31.1636
2012-04-01	33.0437
2012-07-01	34.1009
2012-10-01	34.0688
2013-01-01	37.3380
2013-04-01	39.3837
2013-07-01	42.4304
2013-10-01	44.7282
2014-01-01	45.5305
2014-04-01	49.2648
2014-07-01	49.9499
2014-10-01	47.5873
2015-01-01	45.6725
2015-04-01	49.9036