Year Percent 2006-01-01 12.1 2007-01-01 12.1 2008-01-01 12.1 2009-01-01 12.1 2010-01-01 12.1 2011-01-01 12.1 2012-01-01 12.1 2013-01-01 12.1 2014-01-01 21.8