Year Percent 2000 90.45151 2001 90.45151 2002 90.45151 2003 90.45151 2004 90.45151 2005 90.54529 2006 90.61766 2007 90.68998 2008 90.76226 2009 90.83449 2010 90.90668 2011 90.97883 2012 91.05093 2013 91.12299 2014 91.195 2015 91.26697 2016 91.3389 2017 91.41078 2018 91.41078 2019 91.41078 2020 91.41078 2021 91.41078