Year Percent 2000 53.94104 2001 54.87502 2002 55.79591 2003 56.71637 2004 57.63638 2005 58.55596 2006 59.4751 2007 60.39381 2008 61.31207 2009 62.2299 2010 63.14729 2011 64.06424 2012 64.98075 2013 65.89683 2014 66.81246 2015 67.72766 2016 68.64243 2017 69.55675 2018 70.47064 2019 71.38408 2020 72.29709 2021 73.20967 2022 74.1218