Year Percent 2000 24.52661 2001 24.26991 2002 24.01321 2003 23.9228 2004 23.82879 2005 23.73119 2006 23.63 2007 23.52521 2008 23.41683 2009 23.30485 2010 23.18929 2011 23.07012 2012 22.94737 2013 22.82102 2014 22.69107 2015 22.55754 2016 22.42041 2017 22.27968 2018 22.13537 2019 21.98745 2020 21.83595 2021 21.68085 2022 21.68085