Year Percent 2000 47.77974 2001 48.63481 2002 49.48988 2003 50.34495 2004 51.20002 2005 52.05508 2006 52.91015 2007 54.35816 2008 55.82502 2009 57.31074 2010 58.81532 2011 60.33876 2012 61.88106 2013 63.44222 2014 65.02224 2015 66.62112 2016 68.23886 2017 69.87546 2018 71.53091 2019 73.20523 2020 74.89841 2021 76.61045 2022 77.40303