Year Number 2004 40.3940887451172 2005 72.1951217651367 2006 71.2195129394531 2007 71.8446578979492 2008 73.3009719848633 2009 72.7272720336914 2010 71.9047622680664 2011 71.5639801025391 2012 71.0900497436523 2013 69.6682434082031 2014 29.8076915740967 2015 55.238094329834 2016 57.1428565979004 2017 56.1904754638672 2018 55.7142868041992 2019 52.8571434020996 2020 52.3809509277344 2021 52.8571434020996 2022 51.886791229248