Year Percent 2000 79.78221 2001 80.43832 2002 81.09444 2003 81.75056 2004 82.40667 2005 83.25088 2006 84.09805 2007 84.9482 2008 85.80132 2009 86.65741 2010 87.51647 2011 88.3785 2012 89.24351 2013 90.11148 2014 90.98243 2015 91.85635 2016 92.73324 2017 93.6131 2018 94.49593 2019 95.38173 2020 96.27051 2021 97.16226 2022 98.05698