Year Percent 2000 69.3885 2001 70.18463 2002 71.05694 2003 71.93096 2004 72.80669 2005 73.68412 2006 74.56327 2007 75.44412 2008 76.32669 2009 77.21096 2010 78.09694 2011 78.98463 2012 79.87403 2013 80.76514 2014 81.65796 2015 82.55248 2016 83.44872 2017 84.34666 2018 85.24631 2019 86.14767 2020 87.05074 2021 87.87283 2022 87.87283