Quarter Billions of US Dollars 1999-04-01 0.05 1999-07-01 0.05 1999-10-01 0.05 2000-01-01 0.05 2011-10-01 0.50 2012-01-01 0.50 2012-04-01 0.50 2012-07-01 0.50 2014-01-01 0.50 2014-04-01 0.50 2014-07-01 0.50 2014-10-01 0.50