Year Number 1996 44.8087425231934 1998 54.6448097229004 2000 54.0983619689941 2002 51.8918914794922 2003 54.5945930480957 2004 51.7412948608398 2005 55.8823547363281 2006 56.5853652954102 2007 54.8543701171875 2008 57.7669906616211 2009 57.8947372436523 2010 57.4162673950195 2011 59.7156410217285 2012 59.2417068481445 2013 57.8199043273926 2014 63.461540222168 2015 66.6666641235352 2016 65.7142868041992 2017 64.7619018554688 2018 66.1904754638672 2019 66.6666641235352 2020 70.9523773193359 2021 72.8571395874023 2022 71.2264175415039