Quarter	Billions of US Dollars
1997-04-01	0.05770
2001-01-01	0.03850
2002-04-01	-0.04672
2002-10-01	0.09967
2004-01-01	0.33661
2004-07-01	0.55350
2006-07-01	0.19179
2007-04-01	0.33772
2009-07-01	-0.64359
2011-01-01	-0.40993
2012-10-01	-0.12973
2013-07-01	0.19903