Year Percent 2000 79.25337 2001 79.78295 2002 80.31161 2003 80.83935 2004 81.36619 2005 81.8921 2006 82.41711 2007 82.9412 2008 83.46437 2009 83.98664 2010 84.50798 2011 85.02842 2012 85.54794 2013 86.06655 2014 86.58424 2015 87.10102 2016 87.61688 2017 88.13183 2018 88.71535 2019 89.29887 2020 89.88238 2021 90.4659 2022 91.04942