Year | Value | 2022 | 33.209803608774 | 2021 | 32.764468459677 | 2020 | 32.422850080189 | 2019 | 32.631034115301 | 2018 | 31.101993376145 | 2017 | 30.566293740541 | 2016 | 30.264960884947 | 2015 | 29.971724987856 | 2014 | 29.688009424489 | 2013 | 29.648743504443 | 2012 | 29.069018991619 | 2011 | 28.92658411724 | 2010 | 28.548603459014 | 2009 | 28.1585059882 | 2008 | 27.658010287291 | 2007 | 27.21611787454 | 2006 | 26.936596557513 | 2005 | 26.769398312007 | 2004 | 26.587244990701 | 2003 | 26.681582316098 | 2002 | 26.675007436701 | 2001 | 26.684221550615 | 2000 | 26.762449738019 | 1999 | 26.949577152574 | 1998 | 27.14915748264 | 1997 | 27.422502536398 | 1996 | 27.467742305136 | 1995 | 27.511015107377 | 1994 | 27.576346372402 | 1993 | 27.682034185392 | 1992 | 27.655312655431 | 1991 | 27.65221064393 |
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