Year | Value | 2022 | 68.54 | 2021 | 68.421 | 2020 | 68.315 | 2019 | 68.222 | 2018 | 68.142 | 2017 | 68.075 | 2016 | 68.021 | 2015 | 67.98 | 2014 | 67.952 | 2013 | 67.925 | 2012 | 67.897 | 2011 | 67.869 | 2010 | 67.841 | 2009 | 67.814 | 2008 | 67.834 | 2007 | 67.9 | 2006 | 67.967 | 2005 | 68 | 2004 | 67.9 | 2003 | 67.8 | 2002 | 67.85 | 2001 | 67.95 | 2000 | 68.067 | 1999 | 68.22 | 1998 | 68.451 | 1997 | 68.6 | 1996 | 68.65 | 1995 | 68.75 | 1994 | 68.901 | 1993 | 68.799 | 1992 | 68.852 | 1991 | 69.201 | 1990 | 69.25 | 1989 | 69.2 | 1988 | 69.112 | 1987 | 68.947 | 1986 | 68.782 | 1985 | 68.56 | 1984 | 68.283 | 1983 | 68.003 | 1982 | 67.722 | 1981 | 67.44 | 1980 | 67.095 | 1979 | 66.686 | 1978 | 66.143 | 1977 | 65.487 | 1976 | 64.826 | 1975 | 64.157 | 1974 | 63.484 | 1973 | 62.805 | 1972 | 62.122 | 1971 | 61.433 | 1970 | 60.713 | 1969 | 59.946 | 1968 | 59.175 | 1967 | 58.398 | 1966 | 57.617 | 1965 | 56.832 | 1964 | 56.045 | 1963 | 55.253 | 1962 | 54.459 | 1961 | 53.663 | 1960 | 52.867 |
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