Year | Value | 2021 | 79.121 | 2020 | 79.061 | 2019 | 80.953 | 2018 | 80.684 | 2017 | 80.293 | 2016 | 79.894 | 2015 | 79.787 | 2014 | 79.623 | 2013 | 79.398 | 2012 | 78.838 | 2011 | 78.144 | 2010 | 78.221 | 2009 | 77.988 | 2008 | 77.69 | 2007 | 77.442 | 2006 | 77.124 | 2005 | 76.867 | 2004 | 76.564 | 2003 | 76.252 | 2002 | 75.944 | 2001 | 75.623 | 2000 | 75.274 | 1999 | 73.993 | 1998 | 74.578 | 1997 | 74.218 | 1996 | 73.849 | 1995 | 73.423 | 1994 | 73.057 | 1993 | 72.665 | 1992 | 72.238 | 1991 | 71.871 | 1990 | 71.41 | 1989 | 70.967 | 1988 | 70.514 | 1987 | 69.94 | 1986 | 69.442 | 1985 | 68.923 | 1984 | 68.393 | 1983 | 67.757 | 1982 | 67.172 | 1981 | 66.651 | 1980 | 66.207 | 1979 | 65.695 | 1978 | 65.171 | 1977 | 64.454 | 1976 | 63.565 | 1975 | 63.048 | 1974 | 62.571 | 1973 | 61.972 | 1972 | 61.39 | 1971 | 60.688 | 1970 | 60.111 | 1969 | 59.595 | 1968 | 59.037 | 1967 | 58.45 | 1966 | 57.762 | 1965 | 57.318 | 1964 | 56.788 | 1963 | 56.178 | 1962 | 55.359 | 1961 | 54.618 | 1960 | 53.821 |
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