Year Percent 2000 37.54959 2001 39.8181 2002 42.07388 2003 44.31691 2004 46.54721 2005 48.76477 2006 50.96958 2007 53.16166 2008 55.341 2009 57.5076 2010 59.66147 2011 61.80259 2012 63.93097 2013 66.04662 2014 68.14952 2015 70.23969 2016 72.31711 2017 74.3818 2018 76.43375 2019 78.47296 2020 78.47296 2021 78.47296 2022 78.47296