Quarter Percent 2005-01-01 51.0 2005-04-01 50.7 2005-07-01 50.7 2005-10-01 50.7 2006-01-01 50.0 2006-04-01 50.6 2006-07-01 50.6 2006-10-01 49.6 2007-01-01 50.2 2007-04-01 50.6 2007-07-01 50.8 2007-10-01 49.1 2008-01-01 49.6 2008-04-01 49.3 2008-07-01 51.5 2008-10-01 51.7 2009-01-01 51.4 2009-04-01 52.1 2009-07-01 52.5 2009-10-01 52.2 2010-01-01 51.7 2010-04-01 52.0 2010-07-01 53.1 2010-10-01 53.3 2011-01-01 52.4 2011-04-01 53.0 2011-07-01 53.1 2011-10-01 52.4 2012-01-01 53.1 2012-04-01 53.5 2012-07-01 53.4 2012-10-01 52.8 2013-01-01 52.8 2013-04-01 53.1 2013-07-01 52.9 2013-10-01 53.0 2014-01-01 53.8 2014-04-01 53.8 2014-07-01 54.1 2014-10-01 53.8 2015-01-01 53.7 2015-04-01 54.5 2015-07-01 54.7 2015-10-01 54.9 2016-01-01 55.5 2016-04-01 55.7 2016-07-01 55.6 2016-10-01 55.7 2017-01-01 55.4 2017-04-01 56.3 2017-07-01 55.8 2017-10-01 55.8 2018-01-01 55.7 2018-04-01 55.9