Year Number 1996 80.5 1998 80.5970153808594 2000 81.592041015625 2002 82.5870666503906 2003 84.0796051025391 2004 68.2692337036133 2005 88.461540222168 2006 88.9423065185547 2007 88.9423065185547 2008 90.3846130371094 2009 90.0473937988281 2010 89.5734634399414 2011 88.2629089355469 2012 85.4460067749023 2013 85.4460067749023 2014 84.7290649414063 2015 80.2955627441406 2016 80.7881774902344 2017 77.8325119018555 2018 75.728157043457 2019 75.8454132080078 2020 74.3961334228516 2021 72.9468612670898 2022 72.4637680053711