Year Number 1996 67.7595596313477 1998 65.0273208618164 2000 63.3879776000977 2002 66.4864883422852 2003 60.5405387878418 2004 64.1791076660156 2005 65.6862716674805 2006 71.2195129394531 2007 71.3592224121094 2008 68.4466018676758 2009 71.291862487793 2010 68.8995208740234 2011 72.9857788085938 2012 73.9336471557617 2013 74.407585144043 2014 82.6923065185547 2015 83.8095245361328 2016 81.9047622680664 2017 82.3809509277344 2018 81.9047622680664 2019 80.476188659668 2020 78.0952377319336 2021 80.476188659668 2022 77.3584899902344