Quarter	Billions of US Dollars
1987-01-01	0.4660
1987-04-01	0.2050
1987-07-01	0.3340
1987-10-01	0.3370
1988-01-01	0.3430
1988-04-01	0.3610
1988-07-01	0.2540
1988-10-01	0.2230
1989-01-01	0.1880
1989-04-01	0.1880
1989-07-01	0.3160
1989-10-01	0.2380
1990-01-01	0.2910
1990-04-01	0.4110
1990-07-01	0.6970
1990-10-01	1.5570
1991-01-01	0.2680
1991-04-01	0.3550
1991-07-01	0.4770
1991-10-01	1.0600
1992-01-01	0.7230
1992-04-01	0.8680
1992-07-01	1.9250
1992-10-01	2.2810
1993-01-01	2.5150
1993-04-01	3.9420
1993-07-01	8.8302
1993-10-01	8.8462
1994-01-01	10.1742
1994-04-01	10.4464
1994-07-01	10.9682
1994-10-01	9.5851
1995-01-01	4.9763
1995-04-01	5.3517
1995-07-01	7.4316
1995-10-01	8.2225
1996-01-01	10.6648
1996-04-01	13.5840
1996-07-01	9.6950
1996-10-01	9.6262
1997-01-01	9.4824
1997-04-01	9.0367
1997-07-01	10.5530
1997-10-01	8.5894
1998-01-01	10.8530
1998-04-01	10.8537
1998-07-01	8.1893
1998-10-01	5.7732
1999-01-01	4.2961
1999-04-01	4.8494
1999-07-01	4.5981
1999-10-01	4.9267
2000-01-01	5.6586
2000-04-01	4.6413
2000-07-01	5.0148
2000-10-01	6.1201
2001-01-01	6.0222
2001-04-01	5.9427
2001-07-01	2.7892
2001-10-01	2.5363
2002-01-01	2.2287
2002-04-01	1.8716
2002-07-01	1.7069
2002-10-01	2.1875
2003-01-01	4.3237
2003-04-01	4.2487
2003-07-01	4.6723
2003-10-01	3.7042
2004-01-01	2.6530
2004-04-01	2.0640
2004-07-01	1.5657
2004-10-01	2.2170
2005-01-01	1.9198
2005-04-01	2.0282
2005-07-01	1.8607
2005-10-01	1.8383
2006-01-01	2.0554
2006-04-01	2.7252
2006-07-01	2.3159
2006-10-01	2.0008
2007-01-01	4.3247
2007-04-01	5.1092
2007-07-01	2.7588
2007-10-01	4.0964
2008-01-01	4.3854
2008-04-01	5.3628
2008-07-01	6.0622
2008-10-01	5.4751
2009-01-01	4.8848
2009-04-01	3.7664
2009-07-01	3.7769
2009-10-01	3.2932
2010-01-01	3.4164
2010-04-01	3.8262
2010-07-01	4.0244
2010-10-01	3.8538
2011-01-01	3.6383
2011-04-01	4.5443
2011-07-01	4.9816
2011-10-01	5.5363
2012-01-01	8.0380
2012-04-01	11.1460
2012-07-01	11.7990
2012-10-01	13.7469
2013-01-01	15.2421
2013-04-01	14.8279
2013-07-01	13.6247
2013-10-01	11.8213
2014-01-01	12.4222
2014-04-01	13.0164
2014-07-01	10.7858
2014-10-01	10.6907
2015-01-01	9.3056
2015-04-01	9.9633