Year Percent 2000 73.52858 2001 73.52858 2002 73.52858 2003 73.77587 2004 73.96924 2005 74.16225 2006 74.3549 2007 74.54719 2008 74.73911 2009 74.93068 2010 75.12189 2011 75.31273 2012 75.50322 2013 75.69334 2014 75.88311 2015 76.07251 2016 76.26156 2017 76.45024 2018 76.63856 2019 76.82653 2020 77.01413 2021 77.20137 2022 77.20137