| Year | Value | | 2023 | 151.67071397009 | | 2022 | 138.58440810626 | | 2021 | 120.16830432148 | | 2020 | 116.33197324313 | | 2019 | 114.41839316035 | | 2018 | 110.97405862326 | | 2017 | 107.93614746414 | | 2016 | 105.75588809969 | | 2015 | 106.60730723789 | | 2014 | 106.71897077713 | | 2013 | 108.25421451304 | | 2012 | 107.29915169436 | | 2011 | 104.21990346602 | | 2010 | 100 | | 2009 | 97.619079814594 | | 2008 | 95.003442897473 | | 2007 | 84.561215504924 | | 2006 | 78.006677737501 | | 2005 | 72.725636802491 | | 2004 | 69.236901452824 | | 2003 | 65.227294387079 | | 2002 | 63.730493445071 | | 2001 | 60.230986597591 | | 2000 | 56.101396844915 | | 1999 | 50.855055965649 | | 1998 | 49.57935785861 | | 1997 | 41.778408087814 | | 1996 | 3.6066437942485 | | 1995 | 1.6274914447348 | | 1994 | 1.004284418884 | | 1993 | 0.51224015777867 | | 1992 | 0.29630017289574 | | 1991 | 0.15488937526507 | | 1990 | 0.03532664822737 | | 1989 | 0.028535257049572 | | 1988 | 0.026821651534845 | | 1987 | 0.026200779971539 | | 1986 | 0.025505403820635 | | 1985 | 0.024834862532264 |
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