Year | Value | 2022 | 72.978 | 2021 | 73.103 | 2020 | 73.214 | 2019 | 73.311 | 2018 | 73.394 | 2017 | 73.462 | 2016 | 73.518 | 2015 | 73.559 | 2014 | 73.586 | 2013 | 73.6 | 2012 | 73.6 | 2011 | 73.6 | 2010 | 73.366 | 2009 | 73.131 | 2008 | 72.895 | 2007 | 72.657 | 2006 | 72.418 | 2005 | 72.178 | 2004 | 71.936 | 2003 | 71.693 | 2002 | 71.482 | 2001 | 71.394 | 2000 | 71.306 | 1999 | 71.218 | 1998 | 71.129 | 1997 | 71.041 | 1996 | 70.952 | 1995 | 70.863 | 1994 | 70.774 | 1993 | 70.685 | 1992 | 70.596 | 1991 | 70.507 | 1990 | 70.417 | 1989 | 70.327 | 1988 | 70.237 | 1987 | 70.147 | 1986 | 70.057 | 1985 | 69.967 | 1984 | 69.876 | 1983 | 69.785 | 1982 | 69.695 | 1981 | 69.604 | 1980 | 69.512 | 1979 | 69.595 | 1978 | 69.705 | 1977 | 69.814 | 1976 | 69.924 | 1975 | 70.033 | 1974 | 70.142 | 1973 | 70.25 | 1972 | 70.359 | 1971 | 70.467 | 1970 | 70.575 | 1969 | 70.631 | 1968 | 70.671 | 1967 | 70.711 | 1966 | 70.751 | 1965 | 70.791 | 1964 | 70.831 | 1963 | 70.871 | 1962 | 70.911 | 1961 | 70.951 | 1960 | 70.991 |
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