Year Percent 2000 93.68806 2001 93.92662 2002 94.15829 2003 94.38308 2004 94.6009 2005 94.81155 2006 95.01539 2007 95.21235 2008 95.40267 2009 95.66656 2010 95.92203 2011 96.16904 2012 96.40673 2013 96.6356 2014 96.85616 2015 97.06902 2016 97.27468 2017 97.47361 2018 97.66631 2019 97.85322 2020 98.03481 2021 98.21147 2022 98.38362