Year Number 1996 0.863268733024597 1998 0.936182856559753 2000 0.999929845333099 2002 0.991949141025543 2003 0.827253758907318 2004 0.801826775074005 2005 0.7481929063797 2006 0.839411973953247 2007 0.691066801548004 2008 0.695977866649628 2009 0.66804838180542 2010 0.644822657108307 2011 0.65021163225174 2012 0.608617842197418 2013 0.678978681564331 2014 0.583641827106476 2015 0.510369181632996 2016 0.457560569047928 2017 0.481235712766647 2018 0.443291485309601 2019 0.45059597492218 2020 0.538772940635681 2021 0.5976322889328 2022 0.534344553947449