Year | Value | 2021 | 68.6 | 2020 | 70.6 | 2019 | 70.9 | 2018 | 70.1 | 2017 | 69.8 | 2016 | 69.8 | 2015 | 69.7 | 2014 | 69.1 | 2013 | 69.3 | 2012 | 68.9 | 2011 | 68.6 | 2010 | 68.8 | 2009 | 68.3 | 2008 | 67.2 | 2007 | 65.8 | 2006 | 65.5 | 2005 | 65.6 | 2004 | 67.1 | 2003 | 65.9 | 2002 | 65.4 | 2001 | 65.2 | 2000 | 64.9 | 1999 | 64.46 | 1998 | 63.5 | 1997 | 63.92 | 1996 | 63.04 | 1995 | 60.04 | 1994 | 59.04 | 1993 | 60.43 | 1992 | 62.64 | 1991 | 63.73 | 1990 | 64.2 | 1989 | 65.37 | 1988 | 66.23 | 1987 | 66.41 | 1986 | 66.32 | 1985 | 64.75 | 1984 | 64.08 | 1983 | 63.88 | 1982 | 64.26 | 1981 | 63.44 | 1980 | 63.75 | 1979 | 63.52 | 1978 | 64.1 | 1977 | 64.29 | 1976 | 63.96 | 1975 | 63.94 | 1974 | 64.98 | 1973 | 65.35 | 1972 | 65.23 | 1971 | 65.75 | 1970 | 65.65 | 1969 | 65.27 | 1968 | 65.76 | 1967 | 66.75 | 1966 | 67 | 1965 | 66.79 | 1964 | 67.35 | 1963 | 66.19 | 1962 | 65.85 | 1961 | 66.33 | 1960 | 66.26 |
|