Quarter	Billions of US Dollars
1988-04-01	0.010
1988-07-01	0.005
2006-10-01	0.500
2007-01-01	0.500
2007-04-01	0.500
2007-07-01	0.500
2011-01-01	0.124
2011-04-01	0.124
2011-07-01	0.524
2011-10-01	0.524
2012-01-01	0.400
2012-04-01	0.400