| Year | Value | | 2021 | 90.112182922472 | | 2020 | 90.138263665595 | | 2019 | 90.164344408717 | | 2018 | 90.19042515184 | | 2017 | 90.216505894962 | | 2016 | 90.242586638085 | | 2015 | 90.268667381208 | | 2014 | 90.294819578421 | | 2013 | 90.320971775634 | | 2012 | 90.347123972847 | | 2011 | 90.373276170061 | | 2010 | 90.399428367274 | | 2009 | 90.425580564487 | | 2008 | 90.451732761701 | | 2007 | 90.477884958914 | | 2006 | 90.504037156127 | | 2005 | 90.530189353341 | | 2004 | 90.556341550554 | | 2003 | 90.582493747767 | | 2002 | 90.60864594498 | | 2001 | 90.634798142194 | | 2000 | 90.660950339407 | | 1999 | 90.687066809575 | | 1998 | 90.713183279743 | | 1997 | 90.739299749911 | | 1996 | 90.765416220079 | | 1995 | 90.791532690246 | | 1994 | 90.817649160414 | | 1993 | 90.843765630582 | | 1992 | 90.86988210075 | | 1991 | 90.895998570918 | | 1990 | 90.922115041086 |
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