Year | Value | 2022 | 46.935 | 2021 | 47.427 | 2020 | 47.911 | 2019 | 48.385 | 2018 | 48.849 | 2017 | 49.303 | 2016 | 49.746 | 2015 | 50.18 | 2014 | 50.603 | 2013 | 51.015 | 2012 | 51.417 | 2011 | 51.807 | 2010 | 52.187 | 2009 | 52.555 | 2008 | 52.912 | 2007 | 53.258 | 2006 | 53.604 | 2005 | 53.949 | 2004 | 54.294 | 2003 | 54.639 | 2002 | 54.983 | 2001 | 55.327 | 2000 | 55.669 | 1999 | 56.012 | 1998 | 56.354 | 1997 | 56.696 | 1996 | 57.036 | 1995 | 54.04 | 1994 | 51.019 | 1993 | 47.991 | 1992 | 44.981 | 1991 | 42 | 1990 | 44.578 | 1989 | 47.186 | 1988 | 49.805 | 1987 | 52.433 | 1986 | 55.044 | 1985 | 57.627 | 1984 | 60.166 | 1983 | 61.806 | 1982 | 62.827 | 1981 | 63.837 | 1980 | 64.833 | 1979 | 65.819 | 1978 | 66.791 | 1977 | 67.748 | 1976 | 68.689 | 1975 | 69.618 | 1974 | 70.53 | 1973 | 71.419 | 1972 | 72.287 | 1971 | 73.14 | 1970 | 73.975 | 1969 | 74.793 | 1968 | 75.593 | 1967 | 76.378 | 1966 | 77.144 | 1965 | 77.892 | 1964 | 78.622 | 1963 | 79.336 | 1962 | 80.031 | 1961 | 80.709 | 1960 | 81.368 |
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