Year | Value | 2021 | 68.494 | 2020 | 69.116 | 2019 | 68.865 | 2018 | 68.789 | 2017 | 68.736 | 2016 | 68.003 | 2015 | 67.826 | 2014 | 67.248 | 2013 | 67.007 | 2012 | 66.759 | 2011 | 66.094 | 2010 | 65.843 | 2009 | 65.12 | 2008 | 64.768 | 2007 | 64.079 | 2006 | 63.765 | 2005 | 63.215 | 2004 | 63.05 | 2003 | 62.982 | 2002 | 62.397 | 2001 | 62.356 | 2000 | 62.24 | 1999 | 61.81 | 1998 | 61.696 | 1997 | 61.725 | 1996 | 61.67 | 1995 | 61.783 | 1994 | 61.773 | 1993 | 61.88 | 1992 | 61.627 | 1991 | 61.682 | 1990 | 61.645 | 1989 | 61.712 | 1988 | 61.481 | 1987 | 61.5 | 1986 | 61.204 | 1985 | 60.975 | 1984 | 60.528 | 1983 | 60.276 | 1982 | 59.804 | 1981 | 59.644 | 1980 | 59.201 | 1979 | 58.86 | 1978 | 58.476 | 1977 | 57.827 | 1976 | 57.303 | 1975 | 56.733 | 1974 | 56.259 | 1973 | 55.739 | 1972 | 55.227 | 1971 | 54.664 | 1970 | 54.18 | 1969 | 53.628 | 1968 | 53.069 | 1967 | 52.513 | 1966 | 51.929 | 1965 | 51.317 | 1964 | 50.692 | 1963 | 49.992 | 1962 | 49.354 | 1961 | 48.768 | 1960 | 48.14 |
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