Year Number 1996 70.7446823120117 1998 72.3404235839844 2000 72.4867706298828 2002 73.0158767700195 2003 74.8743743896484 2004 84.4660186767578 2005 73.7864074707031 2006 71.9806747436523 2007 75.8454132080078 2008 75 2009 71.5639801025391 2010 79.1469192504883 2011 79.620849609375 2012 80.568717956543 2013 79.620849609375 2014 81.4285736083984 2015 83.3333358764648 2016 75.7142868041992 2017 70.9523773193359 2018 73.1132049560547 2019 79.7169799804688 2020 79.7169799804688 2021 82.5471725463867 2022 82.5471725463867