Year Percent 2000 94.30734 2001 94.42354 2002 94.59879 2003 94.77419 2004 94.94973 2005 95.12542 2006 95.30126 2007 95.47724 2008 95.65336 2009 95.82963 2010 96.00605 2011 96.18261 2012 96.35931 2013 96.53616 2014 96.71316 2015 96.8903 2016 97.06758 2017 97.24502 2018 97.42259 2019 97.60031 2020 97.77818 2021 97.95619 2022 98.13435