Quarter	Billions of US Dollars
1977-04-01	0.00990
1979-04-01	0.01470
1982-04-01	-0.01022
1984-10-01	0.20000
1986-04-01	-0.01339
1987-10-01	-0.20000
2003-10-01	0.27000
2004-10-01	0.18670
2005-10-01	0.70000
2006-04-01	1.00000
2006-07-01	0.48452
2006-10-01	1.46123
2007-01-01	0.60000
2007-04-01	0.65000
2007-07-01	2.67500
2008-04-01	1.33000
2008-07-01	-0.04656
2008-10-01	-0.04662
2009-01-01	0.08210
2009-07-01	1.86710
2010-01-01	0.69330
2010-10-01	0.30000
2011-04-01	-1.00000
2011-10-01	0.99995
2012-04-01	1.85000
2012-07-01	-1.00000
2013-01-01	-1.33000
2013-04-01	2.65900
2013-07-01	0.00100
2013-10-01	1.27492
2014-04-01	2.38333
2014-07-01	-0.17553
2015-01-01	-1.29333
2015-04-01	0.01070