Year | Value | 2022 | 88.595929851016 | 2021 | 88.571492338763 | 2020 | 88.548540113588 | 2019 | 88.54136505657 | 2018 | 88.419483296903 | 2017 | 88.136103462501 | 2016 | 87.849420609016 | 2015 | 88.007801940085 | 2014 | 88.278402625695 | 2013 | 88.365486360937 | 2012 | 88.106990370831 | 2011 | 88.136309994942 | 2010 | 88.075012622756 | 2009 | 88.094400423537 | 2008 | 88.099242735714 | 2007 | 88.092030356227 | 2006 | 88.008848190283 | 2005 | 87.950231518412 | 2004 | 87.950814297589 | 2003 | 87.941609535475 | 2002 | 88.065947290238 | 2001 | 88.076346573021 | 2000 | 88.152504008614 | 1999 | 88.134170228035 | 1998 | 88.166814321602 | 1997 | 88.162750052857 | 1996 | 88.121705838354 | 1995 | 88.053529738062 | 1994 | 88.029422232768 | 1993 | 88.001254853959 | 1992 | 87.994940906643 | 1991 | 87.976701142055 |
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