Year | Value | 2022 | 26.003080221769 | 2021 | 25.678497077558 | 2020 | 25.457389453779 | 2019 | 25.503770119336 | 2018 | 25.504376119208 | 2017 | 25.519311785306 | 2016 | 25.472747509983 | 2015 | 24.747924707385 | 2014 | 24.079780280857 | 2013 | 23.295792849408 | 2012 | 21.081304104906 | 2011 | 20.632049845935 | 2010 | 20.159365438841 | 2009 | 19.647997407059 | 2008 | 19.14919383807 | 2007 | 18.789649027869 | 2006 | 18.507861875135 | 2005 | 18.242099429779 | 2004 | 18.081607222304 | 2003 | 17.904875672647 | 2002 | 17.824100962696 | 2001 | 17.739335955916 | 2000 | 17.814563472565 | 1999 | 17.762234159263 | 1998 | 17.651135944286 | 1997 | 17.633959056889 | 1996 | 17.494348258527 | 1995 | 17.46097403689 | 1994 | 17.464682625768 | 1993 | 17.537837913621 | 1992 | 17.589720393758 | 1991 | 17.633828428044 |
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