Year %, all forms 2000 77 2001 76 2002 78 2003 78 2004 77 2005 76 2006 74 2007 75 2008 76 2009 77 2010 76 2011 76 2012 76 2013 75 2014 75 2015 74 2016 75 2017 76 2018 77 2019 76 2020 67 2021 72 2022 77