Year | Value | 2021 | 68.334 | 2020 | 67.876 | 2019 | 68.782 | 2018 | 68.479 | 2017 | 68.257 | 2016 | 68.016 | 2015 | 67.657 | 2014 | 67.379 | 2013 | 67.174 | 2012 | 67.277 | 2011 | 67.067 | 2010 | 66.655 | 2009 | 66.18 | 2008 | 66.086 | 2007 | 65.559 | 2006 | 65.202 | 2005 | 64.695 | 2004 | 64.302 | 2003 | 64.043 | 2002 | 63.636 | 2001 | 63.086 | 2000 | 62.727 | 1999 | 62.373 | 1998 | 62.014 | 1997 | 61.722 | 1996 | 61.702 | 1995 | 61.639 | 1994 | 61.769 | 1993 | 61.929 | 1992 | 62.169 | 1991 | 62.132 | 1990 | 62.344 | 1989 | 62.198 | 1988 | 62.056 | 1987 | 61.889 | 1986 | 61.654 | 1985 | 61.144 | 1984 | 60.855 | 1983 | 60.673 | 1982 | 60.407 | 1981 | 60.089 | 1980 | 59.799 | 1979 | 59.293 | 1978 | 59.215 | 1977 | 58.985 | 1976 | 59.203 | 1975 | 59.067 | 1974 | 58.831 | 1973 | 58.621 | 1972 | 58.417 | 1971 | 58.151 | 1970 | 57.794 | 1969 | 57.512 | 1968 | 57.158 | 1967 | 56.75 | 1966 | 56.49 | 1965 | 56.31 | 1964 | 55.779 | 1963 | 55.432 | 1962 | 55.105 | 1961 | 54.938 | 1960 | 54.596 |
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