Year % (national estimate) 1989 90.25886394307446 1996 91.43576826196472 1997 90.53708439897697 1998 90.70967741935483 1999 91.54746423927178 2000 90.40735873850197 2001 90.625 2002 90.5511811023622 2003 90.36939313984169 2004 89.54828454099881 2007 89.90032883835939 2009 88.88073896341236 2010 88.31063073734083 2011 88.08348819178654 2012 88.70838124204099 2013 88.96835505045556 2014 89.00097943192947 2015 88.1789098517194 2016 88.33900136278254 2017 88.13348137182334 2018 86.9309838472834 2019 86.97777174382583 2020 85.97055768110067 2021 87.66323907455012 2022 88.23732145364498