Quarter	Billions of US Dollars
1987-01-01	0.2779
1987-04-01	0.3484
1987-07-01	0.3307
1987-10-01	0.3487
1988-01-01	0.3444
1988-04-01	0.3392
1988-07-01	0.3347
1988-10-01	0.3479
1989-01-01	0.3776
1989-04-01	0.3680
1989-07-01	0.3747
1989-10-01	0.4681
1990-01-01	0.3835
1990-04-01	0.3097
1990-07-01	0.2779
1990-10-01	0.1339
1991-01-01	0.1165
1991-04-01	0.1104
1991-07-01	0.1203
1991-10-01	0.1319
1992-01-01	0.1218
1992-04-01	0.1310
1992-07-01	0.3419
1992-10-01	0.3239
1993-01-01	0.3239
1993-04-01	0.1185
1993-07-01	0.1235
1993-10-01	0.1159
1994-01-01	0.1196
1994-04-01	0.1254
1994-07-01	0.1292
1994-10-01	0.1291
1995-01-01	0.1445
1995-04-01	0.1445
1995-07-01	0.1410
1995-10-01	0.1395
1996-01-01	0.3712
1996-04-01	0.7997
1996-07-01	0.9421
1996-10-01	0.9868
1997-01-01	1.8037
1997-04-01	2.2497
1997-07-01	2.3076
1997-10-01	2.8264
1998-01-01	3.5082
1998-04-01	3.7298
1998-07-01	3.9736
1998-10-01	4.6332
1999-01-01	5.1176
1999-04-01	5.2871
1999-07-01	6.5357
1999-10-01	4.8006
2000-01-01	3.5871
2000-04-01	4.0184
2000-07-01	4.5789
2000-10-01	7.0548
2001-01-01	6.8713
2001-04-01	6.8118
2001-07-01	4.2966
2001-10-01	3.4629
2002-01-01	3.2751
2002-04-01	3.7199
2002-07-01	3.2647
2002-10-01	3.4366
2003-01-01	3.5290
2003-04-01	3.5988
2003-07-01	3.6711
2003-10-01	4.2551
2004-01-01	4.5180
2004-04-01	3.8188
2004-07-01	3.6417
2004-10-01	4.0201
2005-01-01	4.1156
2005-04-01	3.7169
2005-07-01	4.2766
2005-10-01	4.8793
2006-01-01	5.4279
2006-04-01	7.0079
2006-07-01	8.1911
2006-10-01	9.2354
2007-01-01	9.2861
2007-04-01	9.3153
2007-07-01	9.3708
2007-10-01	9.6254
2008-01-01	9.8145
2008-04-01	11.8185
2008-07-01	10.8522
2008-10-01	9.9264
2009-01-01	8.9799
2009-04-01	9.2619
2009-07-01	9.4385
2009-10-01	8.9559
2010-01-01	8.6158
2010-04-01	8.4978
2010-07-01	9.0201
2010-10-01	8.9032
2011-01-01	8.7491
2011-04-01	7.8655
2011-07-01	7.4823
2011-10-01	7.0546
2012-01-01	6.8831
2012-04-01	6.2441
2012-07-01	6.3713
2012-10-01	6.3787
2013-01-01	6.0328
2013-04-01	4.5821
2013-07-01	8.6789
2013-10-01	13.3497
2014-01-01	13.3343
2014-04-01	20.8888
2014-07-01	21.0610
2014-10-01	25.6650
2015-01-01	24.5540
2015-04-01	25.2446