Year | Value | 2021 | 64.21 | 2020 | 66.49 | 2019 | 68.24 | 2018 | 67.75 | 2017 | 67.51 | 2016 | 66.5 | 2015 | 65.92 | 2014 | 65.29 | 2013 | 65.13 | 2012 | 64.56 | 2011 | 64.04 | 2010 | 63.09 | 2009 | 62.87 | 2008 | 61.92 | 2007 | 61.46 | 2006 | 60.43 | 2005 | 58.92 | 2004 | 58.91 | 2003 | 58.53 | 2002 | 58.68 | 2001 | 58.92 | 2000 | 59.03 | 1999 | 59.87 | 1998 | 61.22 | 1997 | 60.85 | 1996 | 59.62 | 1995 | 58.12 | 1994 | 57.55 | 1993 | 58.97 | 1992 | 62 | 1991 | 63.45 | 1990 | 63.73 | 1989 | 64.24 | 1988 | 64.64 | 1987 | 64.84 | 1986 | 64.78 | 1985 | 62.73 | 1984 | 61.71 | 1983 | 62.16 | 1982 | 62.25 | 1981 | 61.62 | 1980 | 61.39 | 1979 | 61.49 | 1978 | 61.83 | 1977 | 61.83 | 1976 | 62.19 | 1975 | 62.48 | 1974 | 63.13 | 1973 | 63.28 | 1972 | 63.25 | 1971 | 63.24 | 1970 | 63.08 | 1969 | 62.068 | 1968 | 62.784 | 1967 | 63.086 | 1966 | 63.449 | 1965 | 63.618 | 1964 | 64.254 | 1963 | 63.624 | 1962 | 63.161 | 1961 | 63.489 | 1960 | 63.394 |
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