Year Percent 2000 96.1015 2001 96.1015 2002 96.1015 2003 96.1015 2004 96.1015 2005 96.22071 2006 96.33988 2007 96.45902 2008 96.57814 2009 96.69722 2010 96.81627 2011 96.9353 2012 97.05429 2013 97.17326 2014 97.29219 2015 97.4111 2016 97.52997 2017 97.64881 2018 97.76763 2019 97.88641 2020 98.00517 2021 98.12389 2022 98.12389