Year Percent 2000 77.73726 2001 78.60421 2002 79.47466 2003 80.34861 2004 81.22605 2005 82.107 2006 82.99144 2007 83.87937 2008 84.77081 2009 85.66574 2010 86.56417 2011 87.4661 2012 88.37152 2013 89.28044 2014 90.19286 2015 91.10878 2016 92.02819 2017 92.9511 2018 93.87751 2019 94.80742 2020 95.74082 2021 96.67772 2022 97.61812