Year Percent 2000 84.40597 2001 84.84643 2002 85.28689 2003 85.72735 2004 86.16781 2005 86.60827 2006 87.04873 2007 87.48919 2008 87.92966 2009 88.37012 2010 88.81058 2011 89.25104 2012 89.6915 2013 90.13196 2014 90.57242 2015 91.01288 2016 91.45335 2017 91.89381 2018 92.33427 2019 92.6 2020 92.6 2021 92.6 2022 92.6