Year | Value | 2022 | 66.269403594771 | 2021 | 66.112072579915 | 2020 | 66.007528096546 | 2019 | 66.464968846673 | 2018 | 66.441650006242 | 2017 | 66.351039833428 | 2016 | 66.249623919134 | 2015 | 66.413380575909 | 2014 | 66.612364702205 | 2013 | 66.741691675003 | 2012 | 66.66880614754 | 2011 | 66.562866362483 | 2010 | 65.919487538592 | 2009 | 65.133189897424 | 2008 | 65.14372957735 | 2007 | 64.114376240926 | 2006 | 63.27215378302 | 2005 | 62.551901313555 | 2004 | 61.180346289392 | 2003 | 59.996954290935 | 2002 | 59.118585712251 | 2001 | 58.412859123796 | 2000 | 57.881458307019 | 1999 | 56.441265540325 | 1998 | 55.165369880863 | 1997 | 54.550120098313 | 1996 | 53.250235759072 | 1995 | 51.600174874402 | 1994 | 50.363433633608 | 1993 | 48.173815173803 | 1992 | 47.762544535018 | 1991 | 47.575274596291 |
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