Year | Value | 2022 | 29.276873302756 | 2021 | 29.074178501358 | 2020 | 28.87148369996 | 2019 | 28.668788898562 | 2018 | 28.466094097164 | 2017 | 28.263529228331 | 2016 | 28.104803606928 | 2015 | 28.104803606928 | 2014 | 27.962600210491 | 2013 | 27.820396814053 | 2012 | 27.678193417616 | 2011 | 27.535990021179 | 2010 | 27.393786624742 | 2009 | 27.27233475826 | 2008 | 27.150882891779 | 2007 | 27.029431025298 | 2006 | 26.907979158817 | 2005 | 26.786527292335 | 2004 | 26.665075425854 | 2003 | 26.543623559373 | 2002 | 26.422171692891 | 2001 | 26.30071982641 | 2000 | 26.179267959929 | 1999 | 26.131859464938 | 1998 | 26.084450969947 | 1997 | 26.037042474955 | 1996 | 25.989633979964 | 1995 | 25.942225484973 | 1994 | 25.894816989982 | 1993 | 25.847408494991 | 1992 | 25.8 | 1991 | 25.752591505009 | 1990 | 25.705183010018 |
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