Year Percent 2000 22 2001 24 2002 45 2003 32 2004 53 2005 40 2006 49 2008 49 2009 55 2010 58 2011 66 2012 64 2013 57 2014 37 2015 42 2016 50 2017 53 2018 53 2019 54 2020 44