Year Percent 2000 99.01266 2001 99.0457 2002 99.07875 2003 99.1118 2004 99.14485 2005 99.17789 2006 99.21094 2007 99.24399 2008 99.27703 2009 99.31008 2010 99.34313 2011 99.37618 2012 99.40922 2013 99.44227 2014 99.47532 2015 99.50836 2016 99.54141 2017 99.57446 2018 99.60751 2019 99.64055 2020 99.6736 2021 99.70665 2022 99.73969