Year Percent 2000 92.06886 2001 92.04609 2002 92.02351 2003 92.00116 2004 92.42999 2005 92.86298 2006 93.30008 2007 93.74121 2008 94.18629 2009 94.63535 2010 95.08718 2011 95.54299 2012 96.0032 2013 96.46774 2014 96.93652 2015 97.40946 2016 97.88647 2017 98.36745 2018 98.85227 2019 99.34076 2020 99.48878 2021 99.53949 2022 99.55866