Year Number 1996 81 1998 74.6268692016602 2000 75.6218872070313 2002 75.6218872070313 2003 83.5820922851563 2004 82.6923065185547 2005 81.25 2006 76.9230804443359 2007 75.961540222168 2008 75.4807662963867 2009 79.620849609375 2010 81.0426559448242 2011 82.1596221923828 2012 84.5070419311523 2013 84.9765243530273 2014 79.3103485107422 2015 78.8177337646484 2016 77.3399047851563 2017 80.2955627441406 2018 79.6116485595703 2019 77.7777786254883 2020 79.22705078125 2021 82.125602722168 2022 80.1932373046875