Year Percent 2000 94.01889 2001 94.28275 2002 94.54661 2003 94.81047 2004 95.07434 2005 95.3382 2006 95.60206 2007 95.86592 2008 96.12978 2009 96.39364 2010 96.65751 2011 96.92137 2012 97.18523 2013 97.44909 2014 97.71295 2015 97.97681 2016 98.24068 2017 98.50454 2018 98.7684 2019 98.77175 2020 98.77175 2021 98.77175 2022 98.77175