Quarter	Billions of US Dollars
1993-07-01	0.46550
1993-10-01	0.08701
1994-01-01	-0.04747
1994-04-01	-0.07023
1994-07-01	0.25569
1994-10-01	-0.03355
1995-01-01	0.47633
1995-04-01	0.28408
1995-07-01	0.22853
1995-10-01	-0.44717
1996-01-01	0.69128
1996-04-01	1.03731
1996-07-01	-1.97167
1996-10-01	-0.96684
1997-01-01	-0.03830
1997-04-01	0.10881
1997-07-01	-0.08372
1997-10-01	-0.08605
1998-01-01	0.18772
1998-04-01	-0.20502
1998-07-01	0.00279
1998-10-01	0.37373
1999-01-01	-0.18457
1999-04-01	0.10420
1999-07-01	0.87755
1999-10-01	-0.11074
2000-01-01	0.00837
2000-04-01	1.49266
2000-07-01	3.49677
2000-10-01	-3.02817
2001-01-01	3.82185
2001-04-01	-0.84773
2001-07-01	-1.31754
2001-10-01	-0.72263
2002-01-01	0.06073
2002-04-01	-0.02651
2002-07-01	-0.43326
2002-10-01	-0.14247
2003-01-01	0.28611
2003-04-01	-0.34768
2003-07-01	-0.10952
2003-10-01	-0.71360
2004-01-01	0.49732
2004-04-01	-0.64104
2004-07-01	0.67995
2004-10-01	-0.85968
2005-01-01	0.93375
2005-04-01	-0.94940
2005-07-01	0.89368
2005-10-01	-0.11561
2006-01-01	-0.16565
2006-04-01	-0.26173
2006-07-01	-0.72753
2006-10-01	1.29619
2007-01-01	1.43630
2007-04-01	-0.24907
2007-07-01	-0.76486
2007-10-01	-0.23633
2008-01-01	-3.35044
2008-04-01	-0.69163
2008-07-01	0.40893
2008-10-01	-0.13035
2009-01-01	0.20260
2009-04-01	-0.22512
2009-07-01	-0.30997
2009-10-01	0.46541
2010-01-01	-0.73365
2011-04-01	1.07943
2013-01-01	0.08713
2013-04-01	-0.01307
2013-07-01	0.15497
2013-10-01	0.23138
2014-01-01	0.00548
2014-04-01	0.68559
2014-07-01	-0.16823
2014-10-01	-0.21234
2015-01-01	0.23646
2015-04-01	-0.55238