Year | Value | 2021 | 77.571 | 2020 | 77.393 | 2019 | 77.257 | 2018 | 77.067 | 2017 | 76.936 | 2016 | 76.815 | 2015 | 76.65 | 2014 | 76.476 | 2013 | 76.275 | 2012 | 76.099 | 2011 | 75.917 | 2010 | 75.712 | 2009 | 75.678 | 2008 | 75.447 | 2007 | 75.342 | 2006 | 75.068 | 2005 | 74.89 | 2004 | 74.727 | 2003 | 74.472 | 2002 | 74.366 | 2001 | 74.247 | 2000 | 74.089 | 1999 | 74.039 | 1998 | 73.728 | 1997 | 73.547 | 1996 | 73.546 | 1995 | 73.298 | 1994 | 73.211 | 1993 | 73.19 | 1992 | 72.915 | 1991 | 72.843 | 1990 | 72.752 | 1989 | 72.74 | 1988 | 72.652 | 1987 | 72.675 | 1986 | 72.568 | 1985 | 72.495 | 1984 | 72.596 | 1983 | 72.537 | 1982 | 72.297 | 1981 | 72.12 | 1980 | 71.921 | 1979 | 71.526 | 1978 | 71.122 | 1977 | 70.719 | 1976 | 70.208 | 1975 | 69.921 | 1974 | 69.519 | 1973 | 69.167 | 1972 | 68.929 | 1971 | 68.598 | 1970 | 68.272 | 1969 | 68.44 | 1968 | 68.114 | 1967 | 67.944 | 1966 | 67.805 | 1965 | 67.376 | 1964 | 67.02 | 1963 | 66.487 | 1962 | 65.897 | 1961 | 65.318 | 1960 | 64.564 |
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