Year Percent 2000 61.06653 2001 61.95116 2002 62.83579 2003 63.44901 2004 64.05471 2005 64.65286 2006 65.24348 2007 65.82657 2008 66.40212 2009 66.97013 2010 67.53061 2011 68.08355 2012 68.62896 2013 69.16683 2014 69.69717 2015 70.21997 2016 70.73523 2017 71.24296 2018 71.74315 2019 71.74315 2020 71.74315 2021 71.74315 2022 71.74315