Quarter	Billions of US Dollars
1993-07-01	0.081000
1994-01-01	-0.006500
1994-07-01	-0.080500
1995-01-01	-0.002500
1995-07-01	-0.002500
1996-01-01	-0.005000
2005-04-01	0.025000
2006-04-01	-0.025000
2006-07-01	0.015431
2007-01-01	0.019980
2007-07-01	-0.015373
2008-01-01	-0.020014
2010-07-01	0.025798
2011-07-01	-0.028559
2012-01-01	0.012887
2012-04-01	-0.012885