Year Percent 2000 91.2317 2001 91.54473 2002 91.8581 2003 92.17182 2004 92.4859 2005 92.80032 2006 93.11509 2007 93.42797 2008 93.73995 2009 94.05248 2010 94.36547 2011 94.679 2012 94.99133 2013 95.30429 2014 95.61779 2015 95.93187 2016 96.24658 2017 96.56299 2018 96.881 2019 97.20056 2020 97.52156 2021 97.52465 2022 97.52875