Year Percent 2000 54.80644 2001 56.48623 2002 58.17454 2003 59.87139 2004 61.57677 2005 63.29068 2006 65.01312 2007 66.74409 2008 68.48359 2009 70.23162 2010 71.98818 2011 73.75327 2012 75.52689 2013 77.30905 2014 79.09973 2015 80.89894 2016 82.70668 2017 84.52296 2018 86.34776 2019 88.1811 2020 90.02296 2021 91.87336 2022 93.12477