Year Percent 2001 92.39998 2002 92.39998 2003 92.39998 2004 92.39998 2005 92.39998 2006 92.71116 2007 93.02235 2008 93.33353 2009 93.64472 2010 93.9559 2011 94.26709 2012 94.57827 2013 94.88946 2014 95.20064 2015 95.51183 2016 95.82302 2017 96.1342 2018 96.44539 2019 96.75657 2020 97.06776 2021 97.37894 2022 97.37894