Quarter	Billions of US Dollars
1987-01-01	1.0940
1987-04-01	0.8940
1987-07-01	1.0020
1987-10-01	0.9580
1988-01-01	1.2270
1988-04-01	0.9890
1988-07-01	0.9840
1988-10-01	0.9510
1989-01-01	0.8690
1989-04-01	1.4430
1989-07-01	1.6180
1989-10-01	1.9240
1990-01-01	2.2380
1990-04-01	2.9420
1990-07-01	2.4180
1990-10-01	2.3180
1991-01-01	1.9750
1991-04-01	1.9680
1991-07-01	1.6650
1991-10-01	1.9990
1992-01-01	3.0750
1992-04-01	3.4080
1992-07-01	3.1250
1992-10-01	2.2680
1993-01-01	2.6540
1993-04-01	2.8980
1993-07-01	4.3131
1993-10-01	4.9078
1994-01-01	6.4158
1994-04-01	8.1622
1994-07-01	9.3328
1994-10-01	9.2479
1995-01-01	9.1911
1995-04-01	9.6595
1995-07-01	10.0173
1995-10-01	11.4115
1996-01-01	13.4811
1996-04-01	13.9465
1996-07-01	14.1333
1996-10-01	15.0870
1997-01-01	14.9457
1997-04-01	13.6943
1997-07-01	14.9676
1997-10-01	15.6087
1998-01-01	16.5431
1998-04-01	16.3904
1998-07-01	17.8108
1998-10-01	19.1646
1999-01-01	18.2432
1999-04-01	20.1537
1999-07-01	23.0478
1999-10-01	26.0065
2000-01-01	30.3659
2000-04-01	32.4241
2000-07-01	32.3646
2000-10-01	33.3519
2001-01-01	36.8416
2001-04-01	30.5091
2001-07-01	29.6441
2001-10-01	28.4327
2002-01-01	26.8270
2002-04-01	29.0625
2002-07-01	31.0463
2002-10-01	32.0523
2003-01-01	34.0032
2003-04-01	28.2690
2003-07-01	27.5726
2003-10-01	32.7638
2004-01-01	30.5991
2004-04-01	29.2518
2004-07-01	28.0994
2004-10-01	32.1312
2005-01-01	41.2677
2005-04-01	39.3134
2005-07-01	46.4942
2005-10-01	41.2297
2006-01-01	49.4854
2006-04-01	53.6517
2006-07-01	52.8073
2006-10-01	57.4970
2007-01-01	71.9069
2007-04-01	79.5926
2007-07-01	66.9063
2007-10-01	64.6206
2008-01-01	43.6164
2008-04-01	39.9457
2008-07-01	30.7007
2008-10-01	21.9747
2009-01-01	13.0999
2009-04-01	15.0182
2009-07-01	18.8361
2009-10-01	17.1120
2010-01-01	18.0218
2010-04-01	15.2221
2010-07-01	15.3523
2010-10-01	14.5288
2011-01-01	14.5841
2011-04-01	14.9633
2011-07-01	14.4800
2011-10-01	13.9053
2012-01-01	13.0462
2012-04-01	16.2793
2012-07-01	17.5132
2012-10-01	16.8588
2013-01-01	18.3162
2013-04-01	19.5237
2013-07-01	17.1800
2013-10-01	16.3039
2014-01-01	15.2335
2014-04-01	14.8598
2014-07-01	13.8460
2014-10-01	14.4008
2015-01-01	10.9250
2015-04-01	9.5342