Year | Value | 2022 | 28.813741277509 | 2021 | 28.424183011503 | 2020 | 28.094313395224 | 2019 | 27.942254824319 | 2018 | 27.831383550024 | 2017 | 27.592590422852 | 2016 | 27.247631149459 | 2015 | 27.033588065027 | 2014 | 28.874369696224 | 2013 | 29.010485065768 | 2012 | 29.108199180943 | 2011 | 28.88468957915 | 2010 | 30.79811173075 | 2009 | 30.317374503142 | 2008 | 29.966454409632 | 2007 | 29.69470699735 | 2006 | 29.027447463839 | 2005 | 28.557 | 2004 | 28.122981571317 | 2003 | 27.797220206849 | 2002 | 27.379605763347 | 2001 | 26.990507405461 | 2000 | 26.616967323618 | 1999 | 26.340878528874 | 1998 | 26.05843820031 | 1997 | 25.91864214592 | 1996 | 25.797269875569 | 1995 | 25.696473434447 | 1994 | 25.544632992436 | 1993 | 25.486798562684 | 1992 | 25.409873126972 | 1991 | 25.371168218001 |
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