| Year | Value | | 2022 | 126.34740464752 | | 2021 | 119.64103830605 | | 2020 | 116.26367998296 | | 2019 | 116.21891118228 | | 2018 | 113.39399985954 | | 2017 | 110.88157476553 | | 2016 | 109.22333838845 | | 2015 | 109.60297781819 | | 2014 | 107.60002167589 | | 2013 | 105.99550785961 | | 2012 | 105.23527269115 | | 2011 | 103.1987814166 | | 2010 | 100 | | 2009 | 98.673797145601 | | 2008 | 96.679554395891 | | 2007 | 92.525563739271 | | 2006 | 90.275379535244 | | 2005 | 88.168310094908 | | 2004 | 86.787002794304 | | 2003 | 85.943115281726 | | 2002 | 83.419633607276 | | 2001 | 81.645015571877 | | 2000 | 80.008842915126 | | 1999 | 78.743955592022 | | 1998 | 77.768544969728 | | 1997 | 76.74279057338 | | 1996 | 76.327454437436 | | 1995 | 75.289114097575 | | 1994 | 73.764407516291 | | 1993 | 72.746441651728 | | 1992 | 70.818136269516 | | 1991 | 66.974978798456 | | 1990 | 62.526423126004 | | 1989 | 59.737106968479 | | 1988 | 56.68320937479 | | 1987 | 54.293007587071 | | 1986 | 51.337767478053 | | 1985 | 48.691953116414 | | 1984 | 46.548395040373 | | 1983 | 44.77256031629 | | 1982 | 43.050538765663 | | 1981 | 40.608880671757 | | 1980 | 36.546878419031 | | 1979 | 32.602661498006 | | 1978 | 29.885640398721 | | 1977 | 28.165019538489 | | 1976 | 27.294363099484 | | 1975 | 26.180177528602 | | 1974 | 23.722602497953 | | 1973 | 20.980114299888 | | 1972 | 19.889804134018 | | 1971 | 18.618040889554 | | 1970 | 17.796726954531 | | 1969 | 16.765309454519 | | 1968 | 15.390086121392 | | 1967 | 14.721574778853 | | 1966 | 13.962336896827 |
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