Year | Value | 2021 | 66.33 | 2020 | 67.09 | 2019 | 68.82 | 2018 | 68.84 | 2017 | 68.72 | 2016 | 67.99 | 2015 | 67.49 | 2014 | 66.9 | 2013 | 65.91 | 2012 | 64.74 | 2011 | 63.85 | 2010 | 63.55 | 2009 | 63.55 | 2008 | 61.9 | 2007 | 60.7 | 2006 | 60.6 | 2005 | 60.3 | 2004 | 60.6 | 2003 | 60.5 | 2002 | 60.7 | 2001 | 60.5 | 2000 | 60.2 | 1999 | 60.6 | 1998 | 59 | 1997 | 58.4 | 1996 | 58 | 1995 | 58 | 1994 | 59.7 | 1993 | 60.1 | 1992 | 62.4 | 1991 | 62.6 | 1990 | 63.8 | 1989 | 63.9 | 1988 | 64.8 | 1987 | 64.9 | 1986 | 64.45 | 1985 | 64 | 1984 | 64 | 1983 | 63.15 | 1982 | 62.3 | 1981 | 61.95 | 1980 | 61.6 | 1979 | 57.218 | 1978 | 57.09 | 1977 | 56.853 | 1976 | 56.734 | 1975 | 56.655 | 1974 | 56.344 | 1973 | 56.213 | 1972 | 55.973 | 1971 | 55.63 | 1970 | 55.402 | 1969 | 55.258 | 1968 | 55.113 | 1967 | 54.95 | 1966 | 54.748 | 1965 | 54.669 | 1964 | 54.377 | 1963 | 54.185 | 1962 | 53.972 | 1961 | 53.766 | 1960 | 53.491 |
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