Year Percent 2000 89.66957 2001 90.11673 2002 90.5603 2003 91.00541 2004 91.45203 2005 91.91387 2006 92.38925 2007 92.86344 2008 93.33645 2009 93.79765 2010 94.24874 2011 94.7096 2012 95.18639 2013 95.66101 2014 96.1336 2015 96.60414 2016 97.07374 2017 97.54207 2018 97.99053 2019 98.00147 2020 98.01335 2021 98.02597 2022 98.0394