Year Percent 2005-01-01 95.600 2006-01-01 95.500 2007-01-01 95.800 2008-01-01 95.900 2009-01-01 96.000 2010-01-01 94.625 2011-01-01 95.100 2012-01-01 95.150 2013-01-01 94.725 2014-01-01 95.050 2015-01-01 95.450 2016-01-01 95.550 2017-01-01 95.175