Year Percent 2000 83.18615 2001 83.18615 2002 83.18615 2003 83.18615 2004 83.18615 2005 83.17111 2006 83.15607 2007 83.14103 2008 83.12599 2009 83.4475 2010 83.7689 2011 84.09017 2012 84.41132 2013 84.73235 2014 85.05325 2015 85.37404 2016 85.6947 2017 86.01524 2018 86.33566 2019 86.65596 2020 86.97613 2021 86.96036 2022 86.94459