Year Percent 2000 61.64383 2001 62.90154 2002 64.17195 2003 65.45506 2004 66.75087 2005 68.05939 2006 69.3806 2007 70.71451 2008 72.06112 2009 73.42043 2010 74.79244 2011 76.17716 2012 77.57457 2013 78.98468 2014 80.40749 2015 81.84301 2016 83.29122 2017 84.75213 2018 86.22574 2019 87.71205 2020 89.21107 2021 90.72278 2022 91.48782