Year Percent 2000 93.81618 2001 94.19997 2002 94.57653 2003 94.9454 2004 95.3063 2005 95.65872 2006 95.99456 2007 96.30399 2008 96.62839 2009 96.94978 2010 97.26818 2011 97.58355 2012 97.89587 2013 98.2051 2014 98.51124 2015 98.81424 2016 99.11409 2017 99.41078 2018 99.49723 2019 99.52721 2020 99.54445 2021 99.56211 2022 99.55835