Year Percent 2000 92.96776 2001 93.02538 2002 93.08243 2003 93.13898 2004 93.19504 2005 93.56922 2006 93.94447 2007 94.32091 2008 94.69889 2009 95.07841 2010 95.45977 2011 95.84313 2012 96.22862 2013 96.61643 2014 97.00678 2015 97.39979 2016 97.79566 2017 98.19458 2018 98.59668 2019 99.00214 2020 99.41114 2021 99.81926 2022 99.81821