Year Number 1996 0.264631718397141 1998 0.274148970842361 2000 0.259488463401794 2002 0.30235281586647 2003 0.313361704349518 2004 0.557232975959778 2005 0.445573747158051 2006 0.377330452203751 2007 0.409872740507126 2008 0.264064759016037 2009 0.153662070631981 2010 0.356976479291916 2011 0.600148975849152 2012 0.584973394870758 2013 0.249155893921852 2014 0.819992661476135 2015 0.847117483615875 2016 0.67782860994339 2017 0.481969594955444 2018 0.273657262325287 2019 0.142603352665901 2020 0.435303300619125 2021 0.48798930644989 2022 0.543191194534302