Year Number 1996 64.6739120483398 1998 64.6739120483398 2000 63.5869560241699 2002 57.2972984313965 2003 55.6756744384766 2004 52.7363166809082 2005 53.4313735961914 2006 51.470588684082 2007 50 2008 51.9417457580566 2009 51.6746406555176 2010 51.6746406555176 2011 53.554500579834 2012 56.3981056213379 2013 58.2938385009766 2014 52.8846168518066 2015 52.8571434020996 2016 55.238094329834 2017 57.1428565979004 2018 60 2019 59.0476188659668 2020 50.476188659668 2021 50.9523811340332 2022 52.3584899902344