Year Percent 2003-01-01 54 2004-01-01 58.9 2005-01-01 58.9 2006-01-01 58.9 2007-01-01 58.9 2008-01-01 153.6 2009-01-01 142.5 2010-01-01 133.6 2011-01-01 121.4 2012-01-01 120.7 2013-01-01 113.8 2014-01-01 114.5 2015-01-01 114.2