Year Percent 2000 46 2001 43 2002 50 2003 57 2004 58 2005 57 2006 56 2007 58 2008 61 2009 63 2010 62 2011 68 2012 76 2013 79 2014 75 2015 78 2016 75 2017 75 2018 69 2019 68 2020 59