Year % 2000 0.762571346456961 2001 0.797445896327254 2002 0.773066687395552 2003 0.797880456460384 2004 0.807854994710111 2005 0.726309274916144 2006 0.696527437283675 2007 0.737459690077778 2008 0.721279249470152 2009 0.693883939469359 2010 0.699452983887629 2011 0.669332963042146 2012 0.675614647536985 2013 0.658972808711526 2014 0.666938233413818 2015 0.671466944293562 2016 0.587766249273852 2017 0.590884905011357 2018 0.56360652584134 2019 0.564086183475754 2020 0.500550515801915