Year Percent 2000 61.66996 2001 61.66996 2002 61.66996 2003 61.66996 2004 61.66996 2005 63.0357 2006 64.40143 2007 65.76717 2008 67.13291 2009 68.49864 2010 69.86438 2011 71.23011 2012 72.59585 2013 73.96158 2014 75.32732 2015 76.69305 2016 77.60588 2017 77.90905 2018 77.90905 2019 77.90905 2020 77.90905 2021 77.90905