Year Percent 2000 71.37947 2001 71.78769 2002 72.19328 2003 72.59624 2004 72.99656 2005 73.39424 2006 73.78929 2007 74.18171 2008 74.57149 2009 74.95863 2010 75.34314 2011 75.72502 2012 76.10426 2013 76.48086 2014 76.85483 2015 77.22617 2016 77.59487 2017 77.96093 2018 78.32436 2019 78.68515 2020 79.04331 2021 79.39884 2022 79.75173