Quarter	Billions of US Dollars
1997-01-01	0.07500
2000-01-01	-0.07500
2005-10-01	0.65250
2006-10-01	0.27814
2008-10-01	-0.50000
2011-07-01	0.00794
2011-10-01	-0.22143
2012-01-01	0.08845
2012-04-01	0.00001
2012-07-01	0.00001
2012-10-01	0.00001
2013-01-01	0.00001
2013-04-01	0.00001
2013-07-01	0.00001
2013-10-01	-0.22136
2014-01-01	-0.04730
2014-04-01	0.00001
2014-07-01	0.00001
2014-10-01	0.00001
2015-01-01	-0.02926
2015-04-01	0.00001