Year Number 1996 83.606559753418 1998 78.6885223388672 2000 77.5956268310547 2002 76.7567596435547 2003 74.594596862793 2004 73.6318435668945 2005 75 2006 70.7317047119141 2007 69.9029159545898 2008 70.3883514404297 2009 69.3779907226563 2010 69.8564605712891 2011 68.7203826904297 2012 69.1943130493164 2013 66.8246459960938 2014 62.019229888916 2015 62.3809509277344 2016 63.8095245361328 2017 55.7142868041992 2018 52.3809509277344 2019 50 2020 49.0476188659668 2021 48.5714302062988 2022 48.113208770752