Year | Value | 2021 | 16.534496431404 | 2020 | 16.494845360825 | 2019 | 16.613798572561 | 2018 | 16.574147501983 | 2017 | 16.534496431404 | 2016 | 16.494845360825 | 2015 | 16.415543219667 | 2014 | 16.336241078509 | 2013 | 16.375892149088 | 2012 | 16.415543219667 | 2011 | 16.415543219667 | 2010 | 16.415543219667 | 2009 | 16.65344964314 | 2008 | 16.805390408244 | 2007 | 17.082837891399 | 2006 | 17.26307510814 | 2005 | 17.616987809674 | 2004 | 18.128195045222 | 2003 | 18.52143138026 | 2002 | 19.622493118364 | 2001 | 22.335823830122 | 2000 | 21.824616594573 | 1999 | 23.122296500197 | 1998 | 23.082972866693 | 1997 | 23.594180102241 | 1996 | 23.948092803775 | 1995 | 23.830121903264 | 1994 | 23.948092803775 | 1993 | 23.948092803775 | 1992 | 23.830121903264 |
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