Year Number 1996 52.1276588439941 1998 63.2978706359863 2000 55.5555572509766 2002 65.6084671020508 2003 63.3165817260742 2004 65.0485458374023 2005 64.0776672363281 2006 63.7681159973145 2007 61.835750579834 2008 56.25 2009 62.0853080749512 2010 62.0853080749512 2011 58.2938385009766 2012 58.2938385009766 2013 54.028434753418 2014 59.0476188659668 2015 58.5714302062988 2016 54.2857131958008 2017 50.9523811340332 2018 44.3396224975586 2019 51.4150924682617 2020 55.6603775024414 2021 55.1886787414551 2022 51.886791229248