Year Percent 2000 49.87319 2001 51.39388 2002 52.9859 2003 54.57614 2004 56.16489 2005 57.74996 2006 59.33268 2007 60.91126 2008 62.48626 2009 64.05566 2010 65.61789 2011 67.17239 2012 68.71864 2013 70.25615 2014 71.78475 2015 73.30373 2016 74.81295 2017 76.3123 2018 77.80117 2019 79.27972 2020 80.74719 2021 82.20399 2022 83.64946