Year Percent 2000 94.82318 2001 95.06794 2002 95.3129 2003 95.55807 2004 95.80345 2005 96.04902 2006 96.2948 2007 96.54079 2008 96.78698 2009 97.03337 2010 97.27996 2011 97.52676 2012 97.77376 2013 98.02097 2014 98.26838 2015 98.51599 2016 98.76381 2017 99.01183 2018 99.26006 2019 99.50848 2020 99.75712 2021 99.75712 2022 99.75712