Year Percent 2000 93.17635 2001 93.51881 2002 93.86142 2003 94.20416 2004 94.54704 2005 94.89006 2006 95.23322 2007 95.57652 2008 95.91995 2009 96.26352 2010 96.60723 2011 96.95108 2012 97.29507 2013 97.63919 2014 97.98345 2015 98.32785 2016 98.67239 2017 99.01707 2018 99.36188 2019 99.70683 2020 99.80873 2021 99.80873 2022 99.80873