Year | Value | 2021 | 73.639400570709 | 2020 | 73.993821191645 | 2019 | 74.086610776023 | 2018 | 73.864311308117 | 2017 | 73.420857557504 | 2016 | 73.448017192421 | 2015 | 73.289160149711 | 2014 | 73.078252013853 | 2013 | 72.819459046859 | 2012 | 72.5857852469 | 2011 | 72.353166286085 | 2010 | 72.119840269601 | 2009 | 71.900720508516 | 2008 | 71.448893114984 | 2007 | 71.424331627367 | 2006 | 71.196527639953 | 2005 | 70.843501582803 | 2004 | 70.402877583787 | 2003 | 70.256050010209 | 2002 | 69.894907537088 | 2001 | 69.534792403046 | 2000 | 69.167371927939 | 1999 | 68.825436282883 | 1998 | 68.509495697934 | 1997 | 68.202550688136 | 1996 | 67.824357314899 | 1995 | 67.505589671212 | 1994 | 67.285567302733 | 1993 | 66.940090705029 | 1992 | 66.593837254074 | 1991 | 66.173592417618 | 1990 | 65.811404414157 | 1989 | 65.572197759507 | 1988 | 65.256344454201 | 1987 | 65.027746964794 | 1986 | 64.689133650872 | 1985 | 64.374804862238 | 1984 | 64.01265164524 | 1983 | 63.612143514013 | 1982 | 63.263993986998 | 1981 | 62.811669687631 | 1980 | 62.324461030653 | 1979 | 61.848632042777 | 1978 | 61.276527158012 | 1977 | 60.734391981022 | 1976 | 60.074049738774 | 1975 | 59.29990663001 | 1974 | 58.552833479813 | 1973 | 58.02033762511 | 1972 | 57.196809536856 | 1971 | 56.673131165371 | 1970 | 55.817906410972 | 1969 | 55.206548997686 | 1968 | 54.562051735735 | 1967 | 54.163859967702 | 1966 | 53.323198630483 | 1965 | 52.094764529969 | 1964 | 52.336034449379 | 1963 | 51.673324101342 | 1962 | 51.172298074628 | 1961 | 44.737871918966 | 1960 | 39.970039492004 |
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