Year % of population 2000 23.7090189313949 2001 23.7806046105071 2002 23.8527209414264 2003 23.7773907860889 2004 23.7009736421669 2005 23.7070094634772 2006 23.7115265019149 2007 23.7142029897626 2008 23.7154715165531 2009 23.714033019957 2010 23.7103320121403 2011 23.7040786478568 2012 23.6952287947047 2013 23.6835048300524 2014 23.6691017663676 2015 23.6515218917519 2016 23.6309617028955 2017 23.6071678602562 2018 23.5801084485572 2019 23.5493314888199 2020 23.5152516440623 2021 23.477213342394 2022 23.4356305415008