| Year | Value | | 2022 | 84.128836648232 | | 2021 | 86.519272554745 | | 2020 | 86.42433336486 | | 2019 | 86.372455402181 | | 2018 | 86.255847732723 | | 2017 | 86.045427201417 | | 2016 | 85.803017427998 | | 2015 | 86.15648723256 | | 2014 | 86.169142874926 | | 2013 | 85.935360986271 | | 2012 | 86.096776699411 | | 2011 | 85.188593764386 | | 2010 | 85.594452485654 | | 2009 | 85.638991669203 | | 2008 | 86.55302387462 | | 2007 | 86.039560894959 | | 2006 | 84.337658566262 | | 2005 | 84.224590531363 | | 2004 | 83.304330084468 | | 2003 | 83.98375750376 | | 2002 | 82.84635258788 | | 2001 | 88.00462935065 | | 2000 | 83.734441722522 | | 1999 | 83.644919000611 | | 1998 | 83.722027429655 | | 1997 | 83.230514393479 | | 1996 | 83.214971292239 | | 1995 | 82.916548587423 | | 1994 | 82.571040453739 | | 1993 | 82.136003573211 | | 1992 | 82.433912195468 | | 1991 | 82.515095607462 |
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