| Year | Value | | 2022 | 107.83969063104 | | 2021 | 105.21181226929 | | 2020 | 105.45790121287 | | 2019 | 105.48426788539 | | 2018 | 104.99208999824 | | 2017 | 103.96378976973 | | 2016 | 103.46282299174 | | 2015 | 103.59465635437 | | 2014 | 102.77728950606 | | 2013 | 100.01757778168 | | 2012 | 99.683599929689 | | 2011 | 99.727544383899 | | 2010 | 100 | | 2009 | 100.73358549405 | | 2008 | 102.11503519655 | | 2007 | 100.72495143341 | | 2006 | 100.66451300892 | | 2005 | 100.41412525035 | | 2004 | 100.69904925149 | | 2003 | 100.70768331213 | | 2002 | 100.96670513135 | | 2001 | 101.90781774117 | | 2000 | 102.66761507755 | | 1999 | 103.36697398944 | | 1998 | 103.7209704757 | | 1997 | 103.03887968509 | | 1996 | 101.26889725377 | | 1995 | 101.13075228352 | | 1994 | 101.26026319313 | | 1993 | 100.56090428124 | | 1992 | 99.326233609629 | | 1991 | 97.608055542147 | | 1990 | 94.534329954088 | | 1989 | 91.710992124607 | | 1988 | 89.673353813422 | | 1987 | 89.068969568579 | | 1986 | 88.956726780251 | | 1985 | 88.430049081174 | | 1984 | 86.668700710488 | | 1983 | 84.751939248272 | | 1982 | 83.17190615104 | | 1981 | 80.952952566402 | | 1980 | 77.162599945172 | | 1979 | 71.593630831976 | | 1978 | 69.037948882354 | | 1977 | 66.249147295435 | | 1976 | 61.250026184519 | | 1975 | 56.000517315026 | | 1974 | 50.120722018767 | | 1973 | 40.675059677935 | | 1972 | 36.444369964034 | | 1971 | 34.760728139114 | | 1970 | 32.671285464085 | | 1969 | 30.555565025497 | | 1968 | 29.031465099907 | | 1967 | 27.559921564841 | | 1966 | 26.50251161181 | | 1965 | 25.230675626174 | | 1964 | 23.656126020855 | | 1963 | 22.790016632407 | | 1962 | 21.357583665232 | | 1961 | 19.991103697072 | | 1960 | 18.972568602074 |
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