Year Percent 2000 95.37014 2001 95.55942 2002 95.74872 2003 95.93802 2004 96.12733 2005 96.31664 2006 96.50597 2007 96.6953 2008 96.88464 2009 97.07398 2010 97.26334 2011 97.4527 2012 97.64207 2013 97.83145 2014 98.02083 2015 98.21023 2016 98.39963 2017 98.58903 2018 98.77845 2019 98.96585 2020 99.15325 2021 99.34065 2022 99.52805