Year | Value | 2021 | 72.75 | 2020 | 74.009 | 2019 | 75.338 | 2018 | 75.109 | 2017 | 74.827 | 2016 | 74.442 | 2015 | 74.332 | 2014 | 74.306 | 2013 | 73.918 | 2012 | 73.552 | 2011 | 73.343 | 2010 | 73.182 | 2009 | 72.948 | 2008 | 72.715 | 2007 | 72.365 | 2006 | 72.037 | 2005 | 71.753 | 2004 | 71.131 | 2003 | 70.72 | 2002 | 70.41 | 2001 | 70.195 | 2000 | 69.737 | 1999 | 69.524 | 1998 | 69.189 | 1997 | 68.813 | 1996 | 68.409 | 1995 | 67.919 | 1994 | 67.568 | 1993 | 67.109 | 1992 | 66.708 | 1991 | 66.31 | 1990 | 65.985 | 1989 | 65.868 | 1988 | 65.454 | 1987 | 65.08 | 1986 | 64.64 | 1985 | 64.198 | 1984 | 63.773 | 1983 | 63.331 | 1982 | 62.856 | 1981 | 62.333 | 1980 | 61.781 | 1979 | 61.253 | 1978 | 60.72 | 1977 | 60.24 | 1976 | 59.792 | 1975 | 59.353 | 1974 | 58.881 | 1973 | 58.472 | 1972 | 58.032 | 1971 | 57.586 | 1970 | 57.171 | 1969 | 56.748 | 1968 | 56.31 | 1967 | 55.868 | 1966 | 55.473 | 1965 | 55.084 | 1964 | 54.648 | 1963 | 54.209 | 1962 | 53.71 | 1961 | 53.183 | 1960 | 52.66 |
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