Year Number 1996 46.4480857849121 1998 47.5409851074219 2000 16.3934421539307 2002 17.2972965240479 2003 11.8918914794922 2004 6.46766185760498 2005 6.86274528503418 2006 11.2195119857788 2007 9.70873832702637 2008 8.25242710113525 2009 11.9617223739624 2010 6.69856452941895 2011 10.9004735946655 2012 13.2701425552368 2013 18.4834117889404 2014 19.230770111084 2015 24.2857151031494 2016 24.761905670166 2017 20.4761905670166 2018 28.5714282989502 2019 33.3333320617676 2020 33.8095245361328 2021 32.3809509277344 2022 37.7358474731445