Year Percent 2000 45.23872 2001 45.54814 2002 45.86232 2003 46.51754 2004 47.16636 2005 47.62679 2006 48.07615 2007 48.51373 2008 48.93941 2009 49.35305 2010 49.75451 2011 50.14319 2012 50.519 2013 50.88232 2014 51.23211 2015 51.56879 2016 52.09781 2017 52.61741 2018 53.12702 2019 53.62694 2020 54.11664 2021 54.5956 2022 54.84476