Year | Value | 2023 | 68.771727988149 | 2022 | 67.872569878009 | 2021 | 66.482758472673 | 2020 | 67.49370615959 | 2019 | 67.784060526833 | 2018 | 68.101969533349 | 2017 | 68.488300970441 | 2016 | 69.101732375995 | 2015 | 69.47126235181 | 2014 | 70.638077119226 | 2013 | 70.530693339949 | 2012 | 70.720837644361 | 2011 | 68.373326839383 | 2010 | 67.610694122467 | 2009 | 66.784469917571 | 2008 | 66.279493566828 | 2007 | 65.24634593417 | 2006 | 64.102701126584 | 2005 | 63.326812518188 | 2004 | 63.436077005661 | 2003 | 62.847574431579 | 2002 | 62.871836030346 | 2001 | 62.994971341542 | 2000 | 62.846248617681 | 1999 | 62.513191390055 | 1998 | 63.101119694905 | 1997 | 63.229199031999 | 1996 | 64.005472855547 | 1995 | 62.590126313027 | 1994 | 61.925186022617 | 1993 | 61.093727317916 | 1992 | 60.748985940856 | 1991 | 63.648041623646 |
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