Year | Value | 2022 | 68.923 | 2021 | 68.988 | 2020 | 69.037 | 2019 | 69.069 | 2018 | 69.086 | 2017 | 69.086 | 2016 | 69.07 | 2015 | 69.038 | 2014 | 69.005 | 2013 | 68.973 | 2012 | 68.941 | 2011 | 68.909 | 2010 | 68.946 | 2009 | 69.008 | 2008 | 69.071 | 2007 | 69.133 | 2006 | 69.195 | 2005 | 69.257 | 2004 | 69.319 | 2003 | 69.381 | 2002 | 69.443 | 2001 | 69.505 | 2000 | 69.535 | 1999 | 69.551 | 1998 | 69.568 | 1997 | 69.584 | 1996 | 69.6 | 1995 | 69.478 | 1994 | 69.294 | 1993 | 69.109 | 1992 | 68.924 | 1991 | 68.738 | 1990 | 68.608 | 1989 | 68.503 | 1988 | 68.398 | 1987 | 68.293 | 1986 | 68.187 | 1985 | 68.168 | 1984 | 68.149 | 1983 | 68.129 | 1982 | 68.11 | 1981 | 68.091 | 1980 | 67.791 | 1979 | 67.401 | 1978 | 67.008 | 1977 | 66.613 | 1976 | 66.217 | 1975 | 65.817 | 1974 | 65.415 | 1973 | 65.011 | 1972 | 64.606 | 1971 | 64.197 | 1970 | 63.912 | 1969 | 63.654 | 1968 | 63.396 | 1967 | 63.136 | 1966 | 62.876 | 1965 | 62.615 | 1964 | 62.354 | 1963 | 62.091 | 1962 | 61.828 | 1961 | 61.564 | 1960 | 61.3 |
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