Year Percent 2000 35.10819 2001 36.0818 2002 37.06451 2003 38.0563 2004 39.05717 2005 40.06714 2006 41.08619 2007 42.11432 2008 43.15155 2009 44.19786 2010 45.25325 2011 46.31774 2012 47.39131 2013 48.47396 2014 49.56571 2015 49.8395 2016 50.1133 2017 50.38709 2018 50.66089 2019 50.93468 2020 50.93468 2021 50.93468 2022 50.93468