Year Percent 2000 46.14385 2001 48.52493 2002 50.88386 2003 53.21832 2004 55.52861 2005 57.74584 2006 59.8096 2007 61.85269 2008 63.87598 2009 65.87824 2010 67.86005 2011 69.8214 2012 71.76252 2013 73.6824 2014 75.58182 2015 77.46057 2016 79.59784 2017 81.452 2018 83.28588 2019 85.09983 2020 85.21974 2021 85.3404 2022 85.4618