Year | Value | 2021 | 25.443437168123 | 2020 | 25.597241790955 | 2019 | 25.750003357862 | 2018 | 25.904312426541 | 2017 | 26.054552538506 | 2016 | 26.204514174429 | 2015 | 26.35898743184 | 2014 | 26.517957060235 | 2013 | 26.671371217182 | 2012 | 26.825948852472 | 2011 | 27.114440228903 | 2010 | 27.270162563272 | 2009 | 27.398949250607 | 2008 | 27.52709753035 | 2007 | 27.654952032746 | 2006 | 27.783366101209 | 2005 | 27.911696260306 | 2004 | 28.039823664168 | 2003 | 28.334531228415 | 2002 | 28.463180506892 | 2001 | 28.592085552869 | 2000 | 28.720928099778 | 1999 | 28.874841906016 | 1998 | 29.016117267302 | 1997 | 29.157392632619 | 1996 | 29.298667997936 | 1995 | 29.439943355191 | 1994 | 29.581218716476 | 1993 | 29.714200735197 | 1992 | 29.855436681024 | 1991 | 30.768790031027 | 1990 | 30.91447509391 |
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