Year | Value | 2021 | 17.421314557164 | 2020 | 17.421314557164 | 2019 | 17.421314557164 | 2018 | 17.421314557164 | 2017 | 17.422913616969 | 2016 | 17.42548771324 | 2015 | 17.3248245968 | 2014 | 17.232446012262 | 2013 | 17.140067427724 | 2012 | 17.047688843185 | 2011 | 16.955310258646 | 2010 | 16.862931674108 | 2009 | 16.892454082762 | 2008 | 16.921976491415 | 2007 | 16.951498900069 | 2006 | 16.981021308723 | 2005 | 17.010543717376 | 2004 | 17.04006612603 | 2003 | 17.069588534684 | 2002 | 17.099110943337 | 2001 | 17.128633351991 | 2000 | 17.158155760645 | 1999 | 17.185076083985 | 1998 | 17.211996407326 | 1997 | 17.238916730667 | 1996 | 17.265837054007 | 1995 | 17.292757377348 | 1994 | 17.319677700689 | 1993 | 17.346598024029 | 1992 | 17.37351834737 | 1991 | 17.400438670711 | 1990 | 17.427358994051 |
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