Year Percent 2000 90.33991 2001 90.39238 2002 90.44477 2003 90.49698 2004 90.97987 2005 91.46209 2006 91.94369 2007 92.4247 2008 92.90505 2009 93.38502 2010 93.86457 2011 94.34364 2012 94.82218 2013 95.30014 2014 95.77748 2015 96.25413 2016 96.73006 2017 97.20523 2018 97.67959 2019 98.15311 2020 98.62574 2021 99.09744 2022 99.44161