Year Percent 2000 72.46072 2001 73.05849 2002 73.65627 2003 74.25405 2004 74.85182 2005 75.4496 2006 76.04737 2007 76.64515 2008 77.24293 2009 77.8407 2010 78.43848 2011 78.61479 2012 80.06367 2013 81.52538 2014 82.99991 2015 84.48727 2016 85.98745 2017 87.50046 2018 89.02629 2019 90.56495 2020 92.11644 2021 92.76874 2022 93.42104