Year | Value | 2021 | 70.748 | 2020 | 71.061 | 2019 | 72.559 | 2018 | 72.555 | 2017 | 72.311 | 2016 | 72.025 | 2015 | 71.814 | 2014 | 71.746 | 2013 | 71.771 | 2012 | 71.831 | 2011 | 71.859 | 2010 | 71.848 | 2009 | 71.576 | 2008 | 71.424 | 2007 | 71.108 | 2006 | 70.773 | 2005 | 70.44 | 2004 | 70.34 | 2003 | 70.14 | 2002 | 70.232 | 2001 | 69.598 | 2000 | 69.865 | 1999 | 69.379 | 1998 | 68.478 | 1997 | 67.895 | 1996 | 67.076 | 1995 | 66.33 | 1994 | 65.838 | 1993 | 65.235 | 1992 | 64.657 | 1991 | 63.856 | 1990 | 62.55 | 1989 | 59.685 | 1988 | 61.476 | 1987 | 59.669 | 1986 | 57.741 | 1985 | 57.025 | 1984 | 54.85 | 1983 | 52.203 | 1982 | 51.105 | 1981 | 48.161 | 1980 | 47.975 | 1979 | 52.2 | 1978 | 53.245 | 1977 | 54.024 | 1976 | 54.627 | 1975 | 54.875 | 1974 | 54.668 | 1973 | 54.048 | 1972 | 53.019 | 1971 | 52.241 | 1970 | 51.41 | 1969 | 50.9 | 1968 | 50.775 | 1967 | 50.852 | 1966 | 50.964 | 1965 | 50.897 | 1964 | 50.734 | 1963 | 50.253 | 1962 | 49.6 | 1961 | 48.849 | 1960 | 48.084 |
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