Year Number 1996 79 1998 79.1044769287109 2000 80.0995025634766 2002 77.6119384765625 2003 83.0845794677734 2004 70.1923065185547 2005 82.6923065185547 2006 82.6923065185547 2007 81.25 2008 83.1730804443359 2009 80.568717956543 2010 86.2559204101563 2011 79.3427200317383 2012 78.8732376098633 2013 81.6901397705078 2014 86.6995086669922 2015 76.8472900390625 2016 75.8620681762695 2017 76.8472900390625 2018 76.2135925292969 2019 75.3623199462891 2020 75.8454132080078 2021 73.9130401611328 2022 73.4299545288086