| Year | Value | | 2021 | 126.92600669981 | | 2020 | 131.45444289168 | | 2019 | 109.49292444752 | | 2018 | 107.66089637035 | | 2017 | 106.91355052961 | | 2016 | 107.30732941928 | | 2015 | 105.13247657214 | | 2014 | 104.53969200037 | | 2013 | 100.67443418478 | | 2012 | 100.37435741691 | | 2011 | 97.263945030549 | | 2010 | 91.213105307854 | | 2009 | 85.24721341795 | | 2008 | 72.885749147705 | | 2007 | 65.818326141465 | | 2006 | 65.969380509402 | | 2005 | 67.630740409563 | | 2004 | 67.527827298293 | | 2003 | 66.72009594795 | | 2002 | 64.405381892952 | | 2001 | 62.278174695199 | | 2000 | 52.67544522643 | | 1999 | 54.82181478169 | | 1998 | 55.823124539336 | | 1997 | 54.052993597179 | | 1996 | 54.089162441351 | | 1995 | 52.994293074583 | | 1994 | 45.084509632897 | | 1993 | 42.825874209149 | | 1992 | 42.068263862706 | | 1991 | 39.98914416889 | | 1990 | 36.367566192825 |
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