Year | Value | 2021 | 71.594 | 2020 | 67.994 | 2019 | 70.867 | 2018 | 70.353 | 2017 | 69.905 | 2016 | 69.549 | 2015 | 69.306 | 2014 | 69.069 | 2013 | 68.885 | 2012 | 68.484 | 2011 | 68.148 | 2010 | 67.742 | 2009 | 68.039 | 2008 | 67.688 | 2007 | 67.217 | 2006 | 67.013 | 2005 | 66.514 | 2004 | 66.028 | 2003 | 65.552 | 2002 | 64.846 | 2001 | 64.057 | 2000 | 63.26 | 1999 | 62.621 | 1998 | 61.519 | 1997 | 60.348 | 1996 | 59.129 | 1995 | 59.338 | 1994 | 57.48 | 1993 | 52.867 | 1992 | 55.074 | 1991 | 61.379 | 1990 | 61.879 | 1989 | 61.953 | 1988 | 61.792 | 1987 | 61.254 | 1986 | 60.846 | 1985 | 60.418 | 1984 | 60.093 | 1983 | 59.808 | 1982 | 59.684 | 1981 | 59.456 | 1980 | 59.506 | 1979 | 59.597 | 1978 | 59.531 | 1977 | 59.377 | 1976 | 59.167 | 1975 | 58.876 | 1974 | 58.449 | 1973 | 57.94 | 1972 | 57.637 | 1971 | 57.23 | 1970 | 56.809 | 1969 | 56.484 | 1968 | 56.063 | 1967 | 55.675 | 1966 | 55.347 | 1965 | 55.094 | 1964 | 54.846 | 1963 | 54.542 | 1962 | 54.257 | 1961 | 53.998 | 1960 | 53.628 |
|