Year % (national estimate) 1992 45.61147715594854 1995 39.1753425952259 1996 37.67968773232295 1997 35.69521140908282 1998 36.26824513502474 1999 35.39977671038218 2000 35.23169714980881 2001 35.47296077692349 2002 33.11476940649635 2003 30.815372517289696 2004 30.416878699750395 2005 29.093148815543426 2006 28.643199266719417 2007 27.574261587213922 2008 27.480500997042473 2009 27.38766608048913 2010 27.53647744772051 2011 26.281005550884423 2012 26.75342993432269 2013 26.447105949800285 2014 26.944606936441453 2015 26.789312881607557 2016 26.976043995928556 2017 28.141266557189613 2018 27.96522277179083 2019 27.615989722211186 2020 25.47486733483719 2021 24.40107083733755 2022 24.770073405589738 2023 25.078478050980962