Quarter Percent 2003-09-30 3.63 2003-12-31 3.91 2004-03-31 4.22 2004-06-30 4.67 2004-09-30 4.82 2004-12-31 4.81 2005-03-31 4.86 2005-06-30 4.71 2005-09-30 4.55 2005-12-31 4.6 2006-03-31 4.55 2006-06-30 4.68 2006-09-30 4.97 2006-12-31 5.22 2007-03-31 5.5 2007-06-30 5.89 2007-09-30 6.23 2007-12-31 6 2008-03-31 5.85 2008-06-30 5.72 2008-09-30 6.1 2008-12-31 2.65 2009-03-31 1.46 2009-06-30 0.98 2009-09-30 0.42 2009-12-31 0.43 2010-03-31 0.5 2010-06-30 0.63 2010-09-30 0.62 2010-12-31 0.64 2011-03-31 0.7 2011-06-30 0.7 2011-09-30 0.74 2011-12-31 0.82 2012-03-31 0.82 2012-06-30 0.59 2012-09-30 0.53 2012-12-31 0.5 2013-03-31 0.48