Year % (national estimate) 1992 70.5517208907124 1993 69.80102008791536 1994 70.27349723365998 1995 72.22371539457086 1996 71.38511080257335 1997 71.94272450778259 1998 73.0596144651871 1999 73.70888778874702 2000 73.74128912866675 2001 74.67366566807989 2002 75.74195999796942 2003 76.08828302758074 2004 76.59146904741615 2005 76.56802093911026 2006 77.10087071417382 2007 76.82204679348067 2008 77.02457980077304 2009 77.58376489560371 2010 77.34594964710152 2011 78.17051698129663 2012 78.42609478108072 2013 78.51150360991336 2014 78.82855360690674 2015 79.2839177178413 2016 79.17106563558171 2017 78.39701360830175 2018 78.2160428140654 2019 78.45154559642894 2020 77.7099683306935 2021 78.73833912855234 2022 79.53672434284854 2023 79.32539943511392