Year Number 1996 76.3440856933594 1998 77.5401077270508 2000 82.9787216186523 2002 77.7777786254883 2003 74.6031723022461 2004 72.4137954711914 2005 72.1951217651367 2006 74.1463394165039 2007 73.3009719848633 2008 72.8155364990234 2009 70.8134002685547 2010 71.9047622680664 2011 71.0900497436523 2012 68.2464447021484 2013 64.4549789428711 2014 62.019229888916 2015 61.9047622680664 2016 63.3333320617676 2017 63.3333320617676 2018 65.7142868041992 2019 66.1904754638672 2020 77.1428604125977 2021 78.0952377319336 2022 78.7735824584961