Year Number 1996 64.6739120483398 1998 61.4130439758301 2000 63.5869560241699 2002 63.2432441711426 2003 65.9459457397461 2004 62.1890563964844 2005 64.2156829833984 2006 65.1960754394531 2007 58.2524261474609 2008 53.8834953308105 2009 54.5454559326172 2010 51.6746406555176 2011 46.445499420166 2012 46.445499420166 2013 45.971565246582 2014 47.5961532592773 2015 47.1428565979004 2016 43.8095245361328 2017 40.9523811340332 2018 39.523811340332 2019 42.8571434020996 2020 43.8095245361328 2021 46.1904754638672 2022 47.6415100097656