Year Percent 2000 85.51507 2001 85.51507 2002 85.51507 2003 85.51507 2004 85.39028 2005 85.26515 2006 85.13967 2007 85.01384 2008 84.88768 2009 84.76116 2010 84.63431 2011 84.5071 2012 84.37956 2013 84.25167 2014 84.12343 2015 84.19564 2016 84.26786 2017 84.2953 2018 84.28013 2019 84.28013 2020 84.28013 2021 84.28013 2022 84.28013