Year Percent 2000 96.56833 2001 96.59876 2002 96.62919 2003 96.65963 2004 96.69006 2005 96.89265 2006 97.09535 2007 97.29816 2008 97.50107 2009 97.7041 2010 97.90723 2011 98.11047 2012 98.31382 2013 98.51728 2014 98.72084 2015 98.92451 2016 99.1283 2017 99.33219 2018 99.53619 2019 99.60218 2020 99.63339 2021 99.66459 2022 99.66459