Year Number 1996 0.841138541698456 1998 0.846977770328522 2000 0.746240437030792 2002 0.659822225570679 2003 0.700217008590698 2004 0.715736925601959 2005 0.649010360240936 2006 0.651613116264343 2007 0.578765213489532 2008 0.575648128986359 2009 0.570525586605072 2010 0.602090120315552 2011 0.590838611125946 2012 0.5821533203125 2013 0.600703418254852 2014 0.64037412405014 2015 0.648585200309753 2016 0.648347198963165 2017 0.630477786064148 2018 0.637540757656097 2019 0.642934679985046 2020 0.688375115394592 2021 0.770391166210175 2022 0.707014203071594