Year Percent 2000 55.66912 2001 56.33915 2002 57.00918 2003 57.67921 2004 58.34924 2005 59.01927 2006 59.6893 2007 61.18215 2008 62.69326 2009 64.22264 2010 65.77029 2011 67.33621 2012 68.92039 2013 70.52285 2014 72.14357 2015 73.78256 2016 75.43981 2017 77.11533 2018 78.80912 2019 80.52118 2020 82.25151 2021 84.0001 2022 85.76696