Quarter	Billions of US Dollars
1989-04-01	-0.04000
1994-07-01	0.10000
1997-01-01	0.10000
1997-04-01	0.21196
1997-07-01	0.05000
1997-10-01	-0.00862
2000-01-01	-0.15000
2000-04-01	0.11419
2000-07-01	0.06000
2001-04-01	-0.05000
2001-07-01	0.03750
2002-01-01	0.30000
2002-04-01	0.38000
2002-07-01	0.40000
2002-10-01	0.15000
2003-04-01	0.08081
2003-07-01	-0.06000
2003-10-01	0.30000
2004-01-01	0.22500
2004-04-01	0.65000
2004-07-01	-0.10000
2004-10-01	-0.03750
2005-04-01	0.40000
2005-07-01	0.10000
2005-10-01	-0.04514
2006-04-01	0.23461
2006-07-01	0.20000
2006-10-01	0.20000
2007-04-01	-0.20000
2007-07-01	-0.38000
2008-01-01	-0.15000
2008-07-01	0.43974
2008-10-01	-0.30000
2009-01-01	-0.39265
2009-04-01	-0.46772
2009-07-01	-0.30097
2010-07-01	-0.14890
2010-10-01	0.05411
2011-04-01	0.79073
2011-07-01	0.07704
2011-10-01	-0.05127
2012-01-01	0.69021
2012-04-01	1.18051
2012-07-01	1.74800
2013-01-01	0.44402
2013-04-01	0.16558
2013-07-01	0.18859
2013-10-01	1.38100
2014-01-01	0.67139
2014-04-01	0.61830
2014-07-01	1.09236
2014-10-01	1.45381
2015-01-01	0.15198
2015-04-01	1.00545